A Workshop for Creating Magical/ Fictional Crystals: A Guide from a Geologist

Hi folks, its me, here to talk about fictional writing again! Today I'm just tackling the idea of magical stones/mana stones by looking at existing minerals today and some neat properties that they have, and how you can apply these things to a fictional world. The goal is mainly to help you if you are stuck trying to come up with a unique magic system, or a unique identification/characteristic of your mineral.

First Things First: Mineral Shapes

I am exhausted, petered out, down-right fatigued by seeing every mineral depicted with having the crystal structure of calcite and quartz. There are soooooo many cooler, more interesting crystal structures, don't you think you would stop and take a look at a perfect cube in nature? It is completely unsettling.

Second: Color

Color within minerals can either be really important, or not important at all! It is your choice to decide if color is going to be something that means something to your mineral. But what are some times when the color is important? Well.... there are some elements that are called chromophores, this classification just indicates that these elements, when present, will determine the color of whatever they are in. So, if you wanted to treat mana like a chromophore, you could say, "Oh everything that contains mana turns green!" This could mean that regardless of the mineral, if that mineral is a specific color, it means it contains mana. This concept is exciting because you can just stop here and use minerals that already exist! You can also use it as an indicator for a magical ore! Chromophores are typically metals, so if you are making a new metal weapon, making the ore of that metal a unique color would make a lot of sense!

However, your mineral can also just be every color of the rainbow like quartz and perhaps that's what makes identifying your mana stones elusive and create an illusion of scarcity that your character can solve.

There are other things that can change the colors of minerals, like radiation damage, and electron exchange, but I think that is beyond what would be helpful! So lets talk about some unique color properties that happen in nature that seem magical in the first place! Maybe you don't need to design a mana stone, but you want a unique gemstone that only the royal family passes down or something (IDK).

The first one is the alexandrite effect! This is where a mineral can change color in natural light vs. incandescent light. (the mineral itself is not changing, but the lights contain different amounts of different colors that then get absorbed by the stone). Even if you don't use electricity in your fictional world, you could have the colors change in the presence of light magic. This could create fun misunderstandings about what the mineral is reacting to!

Pleochroism

Pleochroism is something that most minerals have, it is frequently used to help identify minerals in thin sections, however minerals are usually not pleochroic enough for it to be visible to the naked eye! Pleochroism is just a fancy name to describe the change in how light is absorbed based on the angle of the mineral! So if you scroll up to the first image where I showed a lot of crystal shapes, most of them have angles where they are longer and shorter! This will effect the way light travels in the crystal. Tanzanite is a popular mineral that does this.

Photochromism

This is when a mineral will change color (in a reversible way) when exposed to UV light (or sunlight), I am not going to go too into the details of why this is happening because it would require me to read some research papers and I just don't feel like it. The mineral that is best known for this is Hackmanite!

Alright! These are all the really cool color effects that might inspire you or maybe not, but now I am going to talk about how you might find your minerals within a rock!

When I see a lot of magical caves/mines, typically I see them with some variation of a geode honestly, but most minerals are not found like that! Now I am sure most of you guys have seen a geode, so I will not really talk about those, but I will talk briefly about porphyroblasts which is when the mineral grows larger than the minerals around it, this happens in metamorphic minerals!

sorry random stranger, but this is an image of garnets inside a finer-grained rock at gore mountain in New York!

Another way you might find minerals is in a pegmatite! This is when all minerals are really large! This is a formed from really slow crystalizing magma!

But something else to think about is that your mineral might just be massive, it doesn't have to have distinct crystals, it may be similar to jadeite where small grains grow together which leaves it looking smooth and seamless! A note about all of these is that you would have to mine into the rock to find these, there would not be any natural caves in these rocks! Caves are only ever really formed in limestones and maybe marbles (rocks that react with acid).

How can your characters identify these minerals?

Typically when you are out in the field you will look to see what type of rocks the minerals are found in (The overall texture of the rock will tell you how it formed). If you know how the rock formed, it will narrow down the amount of minerals you need to think about by quite a bit! Next, you are going to look closely at it and observe its crystal structure, does it have an obvious crystal? if so what is the general shape? If it is broken, how did it break? Did it fracture like glass or did it break along uniform planes. Some minerals have a thing called cleavage (breaks along planes of weakness). If a mineral exhibits this habit, it will again help narrow this down. Next we can look at color. Color can be misleading, because minerals like quartz can be any color imaginable, but minerals like olivine will always be green! The next thing your character can do is test for hardness, minerals all have a specific hardness that can help identify it as well.

After you go through all of this, your mineral might have some special property! This could be magnetism, fluorescence, reactions to acid, or any of the color changing effects I mentioned above! Other than that, your character can take it back to a lab and do a number of things to identify it, but the most typical thing would be for them to make a thin section (very thin piece of the rock) and observe it under a cross polarized microscope!

On that note folks! I hope this helped in some way in thinking of new magic mineral properties! I have other guides that explore some different fictional worldbuilding issues you might run into, but if you have any topics you would like me to cover please that I haven't mentioned already, let me know!

Writing about Mines in your Fictional Universe: A Geology Introduction

Hello! I'm Bird, and I am here to guide you on a journey about different mines that exist, what materials are being mined, what those materials might be mined for, and what rocks/what processes might make these areas mineable. I will also touch briefly on the idea of gem quality, the commonness of the material, and what these things might look like fresh out of the dirt!

First things first, lets talk about the what types of things we might want to mine for in a fictional universe! There are a lot of things that are used daily that require mining, but there are a few that I see written about the most: Gold, Gemstones, Iron, and Coal. I personally would love to see this idea expanded on a bit, so lets talk about some mines that would definitely be necessary but overlooked! First one is pretty easy, glass! those beautiful stained glass windows are useless if no one is mining quartz to be made to glass, and I imagine it would be quite a profitable business seeing as glass, in general, was a luxury in ye olden times. The next thing we need to address is Abrasives! want to sand and polish stone and metal? Want to sharpen your blades for battle? May I introduce you to abrasive minerals! garnet, corundum (Ruby and Sapphire), and yes, diamond! Why are we using such beautiful gemstones to polish other things? Simple, even if you are to find a deposit of these gemstones (garnet being one of the more common ones) most of the time they are inclusion rich, ridiculously small, an undesirable color, or all three of these.

Finding gemstones that are good quality is hard, your character will not stumble upon it, pick up the rock and immediately know if the location is good enough to mine gemstones. If you are determined to make it a gemstone mine, have your character hold the mineral up to the sun/a light source and let them be able to see light coming through, though it is considerably thick.

Moving into metal mining! Metal mining is both easier and more complicated to write! Why is it complicated? Because unless it is gold or silver you are unlikely to see the desired metal itself. Why is it easy? welllll, I am going to try to make it easy. First things first, a lot of metals are chromaphores, this means that when the element is present, it will influence the color! Copper is an excellent example of this, old pennies oxidize and turn blue/teal/green, so do most rocks bearing copper! Looking for iron? It will probably stain the rocks dingy and brownish red. Things to note: copper and iron can be found in mineable amounts together! If you do this, iron will be present in the form of pyrite, or fool's gold, this has a nice cubic shape and can be described as such, the copper will typically leave a teal residue or veining across the rock, which in this case will almost exclusively be black to dark gray (Its basalt) but it can be found as the mineral chalcopyrite also (looks like fool's gold but it doesn't make cute crystals). Malachite is also a copper ore, in my experience I have never seen malachite from a mine that has looked like some of the stuff I have seen in gem shops, azurite (A darker blue mineral) can be present also, but again, these are usually very fine grained and would not be able to be used as jewelry, but obviously, in some places it must happen, just much less frequently.

Another thing I will briefly mention is that, if you are writing about metals remember that these metals will require a smelting process to extract a pure metal, this usually requires some other material (For iron, it is charcoal). Also remember alloys! Most useable metals are a mix of different metals to make them harder. This even includes gold jewelry. Last comment about metals, a very interesting plot for a fictional universe would be the use of lead. Lead ore was a hot commodity before we knew it was toxic, the side effects (Being nuts) could really create some tension.

Lastly in terms of mined material, I will briefly mention coal and stone in general just to say, coal is a sedimentary rock, distinctly different from the typical environments necessary to form most gemstones and heavy metal deposits (Yes, there are exceptions). Coal is dark black/gray, which is quite uncommon for sedimentary rocks which tend to range from reds/tans/browns/grays. When coal is lifted it will feel much lighter than you anticipate, which is the polar opposite of what happens when you lift a metal rich rock, which will feel immensely heavy. Finally, Coal will not turn into diamonds in nature, diamonds need mantle pressures and temperatures to form, there will be no diamonds under a coal mine unless there was a mantle derived eruption that got covered in a swamp, that became coal and as they dug they exposed the kimberlite pipe (I mention this because I just read this in a story and it hurt my feelings). Finally, If you want to write about a mine that is definitely necessary but want the content to be pretty low-maintenance, but profitable for whoever owns it, owning a granite/marble/ or really any desirable stone quarry would be perfect.

Now I will move onto what kind of mining exists today, I will not talk about every exclusive mine, but I will talk about ones that are common that are on my radar. First up, the one everyone talks about in books, underground mining. Underground mining is used when you are getting the material from the 'primary'/original source. The rock is rich in copper? Lets mine said rock. However, mining underground is the most dangerous form of mining, there can easily be a lack of oxygen because of insufficient ventilation (That's why people will carry something with an open flame when going into abandoned mines; if the flame goes out there is not enough oxygen and you have to turn back). There can also be lots of collapses due to overhead rocks, enough said. Cave mining is primarily done when the amount of rock above the deposit is too great to strip mine.

Now lets talk about strip mining! Strip mining is when you just mine on the surface, and dig deeper and deeper into the ground to obtain your desired resource whether it be stone, coal, gemstones, or anything else. It truly is less glamorous, but it is safer than digging a tunnel. That said it has its own issues, sure the oxygen is good, and you don't have to worry about the rocks collapsing over your head, but oh wait, the rocks can collapse over your head. Landslides can occur due to the over steepening of sides, excessive rainfall, and most importantly, old faults or planes of weakness that happen to be facing towards the mine (the diagram will help this make sense). Both of these types of mines can also create ecological damage, which can be mitigated nowadays, but then maybe not so much. Namely acid mine drainage, I will not talk much on the effects but a quick google search will give you plenty of information that might be useful for writing.

Now both of these are trying to mine a targeted rock, but sometimes its best to let nature do the work so we can do less. Diamonds, gold, corundum (rubies/sapphires), and garnets all have one thing in common. They are dense! So when erosion happens, and that sediment makes its way into a river, everything will separate based on its density. This is just because faster moving water can hold heavier sediments, and slower moving water will drop those heavy sediments leaving only the lighter sediments within the water. Lots of places that mine the things listed above will pan/sieve in active rivers and streams, or they can surface mine where rivers and streams used to be! These are called placer deposits. There is one setback though, the gemstones will not be perfect crystal shaped, they will be rounded due to being thrown around in a river (like beach glass). These are sapphires, but they have been rounded over time in the river.

Final thoughts, writing about a mine can seem nerve-racking, intimidating, or just something that you want to briefly mention and move on from, but truly I think going into the weeds could really add something to a story! Even if stories are slightly inaccurate about information, I am still 100x more excited to see it mentioned in more detail than to see it as a sentence. Besides it is fantasy, it doesn't always have to be exactly like earth.

Geology of Natural Disasters and How to write them into your fictional universe.

So, you want to write about a natural disaster to advance your plot and torture your players/characters even more? Let me tell you how, accurately.

I feel like unless it is a volcano, natural disasters are a pretty slept on plot drivers, and some of them are really cool and unique! Today, I will talk to you about land slides, earthquakes (And earthquake related disasters), and volcanoes.

This indicates that there is soil creeping slowly over time, and it may lead to a major landslide.

2. Earthquakes: Probably one of the easiest things to write, earthquakes can happen anywhere, but they are most common in places that are tectonically active areas. There are about three types of environments you can expect earthquakes to be common. The first is just rugged mountains, if your landscape looks like this, you should write in earthquakes. Associated hazards could be landslides, avalanches, and large falling rocks.

The next landscape could be a thin mountain range, next to the ocean, very scenic, but very dangerous. Essentially, I am describing a subduction zone environment.

Earthquakes in these areas could equal a couple different associated disasters. Scenario one: A very large earthquake happens, and the ocean begins to recede. This is a tsunami, enough said. If you are writing a tsunami though, please, please, do not write it as a large wave, thank you. Also, a common way people are hurt by tsunami's are from them going into the ocean because they don't understand a tsunami is going to happen.

Scenario two: A large earthquake happens, your characters are in a valley and suddenly the ground begins to liquify as the ground shakes, once the shaking stops, the ground becomes solid like nothing ever happened, except everything has suddenly sunk into the now hard ground. This is called liquefaction and it typically happens in areas that have loose dirt or lots of saturated soil.

Scenario three: There are a lot of small earthquakes, they do not cause a lot of damage, but you begin to notice that one of the isolated mountains has a plume rising. Earthquakes can indicate lava moving underground and the filling of magma chambers.

The next environment that can host lots of earthquakes would be regions that have a lot of really deep valleys and small mountain ranges (not cone volcanoes), but overall seems pretty flat.

This indicates a transform fault like the San Andreas. If you want to hint at there being earthquakes in the area, you can show fence posts that are suddenly several feet out of line at a dilapidated farm or something similar.

(These earthquakes are different because they are cased from sideways movement, not an up-and-down movement this hint can only be used for this environment). Volcanoes would not be found here, but liquefaction and landslides could still occur here.

4. Volcanoes: If you thought earthquakes had a lot of information, volcanoes do too. First you have to ask yourself, what kind of volcano you want to have, what kind of eruption style? So lets break down the kind of eruptions you can have and what their landscapes look like. Hawaiian Shield volcano: This will produce a smooth fast lava, the landscape typically is pretty flat, but there will be small cones and the rocks can have a ropey or jagged texture and the rocks will be almost exclusively black to dark red.

Stratovolcanoes: These will be solitary mountains, typically, that look like perfect cones (Picture shown in earthquake section). These will have large ash cloud eruptions and pyroclastic flows, they may have some lava, but typically most damage is done from the pyroclastic flows (think Pompeii). Some hints of these, other than describing the cone features (which can be hidden by other mountains), would be to talk about petrified wood! Trees can get fossilized in the ash and I imagine it would be very strange to find this rock that clearly looks to be a piece of wood, but its a rock. Subcategory- Calderas: Used to be a large stratovolcano, but they erupt so explosively that the entire cone collapses and creates a basin.

There are a lot of kinds of volcanoes out there, so forgive me for just putting an infographic and then talking to you about these really rare types of eruptions that I feel like people should know about.

Okay lets talk about blue lava (kind of) and black lava

You will notice the lava is still red in the middle of this image, during the day these would look like a normal eruption, but at night the burning sulfur would make it appear blue. Some cool features other than this, would be that any water in the area would become very acidic and burn the skin due to sulfuric acid. This would again be really cool if you are trying to describe a 'cursed' land.

Black lava: This happens only in the east African rift I believe, but it is a carbonatite lava, but if you are writing in a rift valley (where the continent is tearing apart to form a new ocean) this might be a cool feature. The lava will cool white and will quickly erode, it makes for a very alien landscape!

Anyway as always, this is supposed to be an introductive guide for the basics of writing geology to create cool landscapes/features into dnd or fictional universes, if you are a geologist please understand my oversimplification of tectonics, I didn't want people to run away.

Geology and the Economy/Trade in Your Fictional World: Explained

Hi, I'm Bird. I am a geology Ph.D. student and I love reading fiction and playing videogames, however something that can really pull me out of a fictional universe is a lack of understanding of basic geology, and how that would influence your fictional world. Today I will cover geology that can effect trade, some landscape features, and construction!

Things that are typically necessary/desired in a fictional world are building materials, gemstones/precious metals, and fossil fuels/ sources of energy. However, a lot of these things are not found together, and they typically have some features to make them more distinct in terms of landscape, so lets talk about it!

Typically, gemstones can be found in two different rock types. The first is intrusive igneous rocks (magma that slowly cooled underground to form course-grained rocks like granite) and high grade metamorphic rocks (rocks that got put under intense heat and pressure under the earth's surface). Some minerals are more likely to form in particular conditions than others, but for the most part these minerals can be found interchangeably within both of these places. *Note: this is a gross oversimplification but we are starting small

(Yes it is a shitty chart better pictures will come further in the post)

If you are writing these minerals based off and igneous deposit, good descriptions for the rocks would be speckled, with mineral grains of about the same size and varying in color. They should NOT be striated, and they will often form bald (unforested) cliffs that are typically rounded and not jagged.

If you are writing with metamorphic rocks, you would expect these rocks to be layered, typically having light and dark layers with some minerals possibly being much larger than the others surrounding it. These textures can definitely (sometimes) be observed from a distance.

*Final notes about minerals* Quartz varieties are difficult, quartz can be found in volcanic, metamorphic, sedimentary, and intrusive igneous settings. If you are writing about agate specifically it is almost always volcanic in nature.

Diamonds are found in volcanic ash deposits called kimberlites, these deposits can occur in any rock type, so while they are igneous, they can be found anywhere. They have zero connection to the surrounding rocks.

2. Fossil Fuels

If a region is producing oil or coal, it is going to be from a sedimentary environment that is very rich in ancient plant material (like millions of years old). A unique feature of these locations would be finding lots of plant fossils, and rocks that can be found in association with these would be sandstone, shale, conglomerates/breccias, and limestones. Sedimentary rocks form in layers, so if exposed the layers will be very visible from a distance. You can also get unique features due to preferential weathering (fancy way of saying some rocks are harder than others, so when exposed to the same weather some rocks will break down faster than others). Also, natural oil seeps are a thing in places where natural oil is prevalent, but I couldn't find a good picture sorry.

3. Building Resources

based on the rocks found in each region, the buildings will be made out of different materials, so lets breakdown what building materials would be used based off what rocks are present in the location.

Sedimentary rocks- lots of options here, so I will just info dump. If the region is drier, limestone is a good choice, historically may desert areas use limestone, it is soft and easy to carve, but it will dissolve slowly with rain. Sandstone is a durable rock that can be used, but it is very hard as it is made of quartz. Clay! shale breaks down in humid environments and will often make clay, this is a great, amazing building resource that could drive economy.

Metamorphic rocks- Marble.... if you want to make luxurious marble temples, metamorphic rocks are a must! Other comments, metamorphic rocks will often have layers of weaker minerals and stronger minerals, that means they will break along a defined surface. A lot of older houses in the Italian Alps (Aosta Valley) use these rocks for roofing. Slate roofing is also common in a lot of places, slate is formed from really low grade metamorphism, so this resource can be available in both sedimentary and metamorphic locations within reason.

Igneous- Granite (light) and Gabbro (dark) is very hard and therefore it is used frequently in countertops today. This is also important because these rocks will take a high shine from polishing. Igneous rocks are also perfect for making cement! Volcanic ash mixed with quicklime and salt water is the recipe for roman concrete which is arguable much better than current day concrete but otherwise doesn't offer much more benefit.

Thank you if you made it this far, I want to make more guides in the future to hopefully cover more geology topics that can influence a story (possibly natural disasters and associated landscape features for subtle foreshadowinggggg)

This guide is very simplified! It is supposed to cover a lot of information for people who may not know a lot about geology, but are interesting in creating fictional universes! If you know a lot about geology already, please avert your eyes, or comment something additional!