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The Earth Story

@earthstory / earthstory.tumblr.com

This is the blog homepage of the Facebook group "The Earth Story" (Click here to visit our Facebook group). “The Earth Story” are group of volunteers with backgrounds throughout the Earth Sciences. We cover all Earth sciences - oceanography, climatology, geology, geophysics and much, much more. Our articles combine the latest research, stunning photography, and basic knowledge of geosciences, and are written for everyone!
We hope you find us to be a unique home for learning about the Earth sciences, and we hope you enjoy!
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geoledgy

I bought a 365 nm UV light to unlock forbidden colors in my minerals. Top is my manganoan calcite I got last week at a rock show (most fluorescent specimen I have in my collection, it turns a pink-orange which is pretty cool) and on the bottom is my cassiterite (not fluorescent) but I found that uv light will shine on dust so it was kinda interesting.

The photo I have does not do the fluorescent property ANY justice, it is very bright IRL. Maybe I'll see if I can take a better photo in the future.

#geology#rock talks#minerals#science#ultraviolet#fluorescent#mineralogy#mineralmonday#the earth story
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Photogenic Fluorite Fluorite is the mineral that gives its name to the term “Fluorescence”, and these crystals of fluorite are fluorescing due to a UV lamp placed just outside the photo area. For a material to Fluoresce, it must be exposed to one type of electromagnetic radiation (light), absorb the energy from that light, and then give it back off as a different type of light.

Source: business.facebook.com
#Fluorite#light#optics#physics#black light#ultraviolet#geology#mineral#cube#crystal#fluroescence#minerals#mineralogy#mineralmonday#the earth story#blue#green#color
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arockmaniac

Baratovite from the type locality of the Dara-i-Pioz Glacier (Dara-Pioz), Alai Range (Alayskiy), Tien Shan Mtn, Districts of Republican Subordination, Tajikistan under short wave ultraviolet, mid-wave ultraviolet, and white light.  The baratovite fluoresces bright bluish white under short wave UV.  Also incorportated in the specimen are agrellite (fluorescent pink), albite (fluorescent red), aegirine (black, non-fluorescent), and an unknown fluorescent green mineral.  The likely candidates for the unknown are willemite & thorite as they are known from the location.  The location is in an extremely remote and dangerous area accessible only by helicopter.  

#baratovite#geology#mineral#tien shan#mineralogy#minerals#ultraviolet#uv#fluorescent#agrellite#albite#aegerine#the earth story
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arockmaniac

Benitoite crystal from the Dallas Gem Mine, San Benito County, California.  While this one is “stony” as opposed to “gemmy,” it’s an extremely sharp and well shaped trigonal crystal measuring .9 cm along the edges.  Shown under white light and short wave ultraviolet light.  Benitoite is a rare barium titanium silicate mineral and is widely considered to be one of the rarest gems/minerals in the world.  It is the state gemstone of California, where it was first discovered in 1907.      

#benitoite#geology#mineral#crystal#ultraviolet#barium#titanium#gemstone#california#the earth story
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arockmaniac

Terlingua Calcite on the left and  fluorapatite from Wana, South Waziristan, Khyber-Pakhtunkhwa (formerly NWFP: North-West Frontier Province), Pakistan on the right.  Shown under short wave ultraviolet, long wave ultraviolet, mid-wave ultraviolet, and white light.  It’s interesting to me that they have opposite pink vs. blue responses to short wave vs. long wave UV.    

#geology#fluorite#pakistan#mineral#fluorescent#ultraviolet#science#minerva mcgonagall#mineralogy#mineralmonday#the earth story#lensblr
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arockmaniac

Septarian from Denton County, Texas, under long wave ultraviolet (black light) and white light.  It has three hearts!  

A septarian is essentially a fossil mud ball.  The mud ball dried up and cracked, then the cracks filled with minerals, and over millions of years, the mud ball turned into rock.  

This one is from a cretaceous formation dating from approximately 88.6 to 96.6 million years ago.  The cracks in this one filled in with calcite (fluorescent pale lemon yellow), aragonite (fluorescent brown and cream), and selenite (fluorescent blue).

One heart is best seen in pic 2, with two others in pics 3 and 4 (one light and one dark).

#geology#mud#crack#septarian nodule#septarian concretion#ultraviolet#mineral#calcite#mineralogy#crystal#texas#mineralmonday#the earth story
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nasa Our Solar Dynamics Observatory watched an active region on the Sun — an area with intense, complex magnetic activity — rotate into view on April 18-19, seen here in extreme ultraviolet. These bright, towering arches consist of charged particles spiraling along magnetic field lines that were revealed in this view in a wavelength of extreme ultraviolet light. They rise up above the Sun's surface many times the size of Earth. This view covers just 16 hours of activity and our scientists are keeping their eyes on this region to see if it has the potential to produce solar storms. Video Credit: NASA/SDO
#sun#science#sunspot#active#cme#corona#space#Solar dynamics observatory#research#magnetic field#the earth story#ultraviolet#star#instagram
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An amazing sapphire crystal Mined in the mid 1990's in a remote corner of the San Jacinto Mountains of California we have an opaque purplish brown corundum crystal in a perfect hexagonal barrel shape with two tapering terminations. The piece is large (14.1 x 7.6 x 5.8 cm, 13 cm for the crystal itself) and set in its metamorphic matrix, a once aluminium rich rock that was heated and squished in the depths of the Earth. Both matrix and crystal are fluorescent (as seen in the last photo), giving off light in visible lower energy wavelengths when excited and stimulated by higher energy and wavelength UV light as electrons in the outer shell of atoms absorb energy, jump up to a higher shell and drop back again giving off the remainder as light (see https://bit.ly/1GPmnMy for a more detailed explanation). Loz Image credit: Rob Lavinsky/iRocks.com

Source: facebook.com
#Sapphire#geology#mineral#mineralogy#mineralmonday#the earth story#ultraviolet
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nasa We ran together three sequences of the Sun taken in three different extreme ultraviolet wavelengths by our Solar Dynamic Observatory (SDO) to better illustrate how features that appear in one sequence are difficult, if not impossible, to see in the others (Mar. 20-21, 2018). In the red sequence, we can see very small jets of solar material burst from the Sun’s surface and some small prominences, bright features extending outward, at the edge, which are not easily discerned in the other two sequences. In the second clip, we can readily observe a coronal hole, the large and dark region where the Sun's magnetic field is open to interplanetary space, though it is difficult to distinguish in the others. In the third clip, we can see strands of plasma waving above the surface, especially above the one small, but bright, active region near the right edge. These are just three of the 10 extreme ultraviolet wavelengths in which SDO images the Sun every 12 seconds every day. That's a lot of data and a lot of science! Credit: NASA/Solar Dynamics Observatory 
#solar dynamics observatory#nasa#science#sdo#sun#corona#prominence#the earth story#plasma#ultraviolet
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Hackmanite: The chameleon mineral.

A pink to purple variety of the mineral Sodalite (see http://on.fb.me/1IakMRj), it displays the weird property known as tenebrescence (aka reversible photochromism), a change of colour in response to sunlight or UV. Material from Quebec and Greenland starts off purple when wrested from the Earth, and fades to a greyish colour, while Burmese or Afghan material develops a strong violet to pink colour when exposed to sunlight that fades when the stone is left in the dark. The effect can be repeated at will (and is exploited in self darkening glasses), but heating the stone destroys it. The energy of the light creates or alters electronic colour centres in the crystal that selectively absorb wavelengths, leaving behind a residual colour such as the red of rubies. In this case it is the electrons of sulphur disseminated in the crystal structure that produce this eerie colour change capacity. Some people call it giving the stone a suntan, if you let Asian Hackmanite fade in the dark and then shine a UV light on it or open the curtain, a near instant colour change results (while it takes a week in the dark for the hue to fade again), a game which is an occasional staple of mineralogy demonstrations.

Before 1991 only small crystals were known, and cuttable material now comes from Canada, Afghanistan and Burma. The variety was named after a Finnish geologist after its discovery in Greenland in 1896. With a Mohs hardness of 5.5-6, it is just about suitable for jewellery use. the specimen is from the Lapis mines of Badakhshan (see http://on.fb.me/1KmBzjI),.

Loz

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Image credit: https://bit.ly/2Izvp6W

https://bit.ly/2Izvp6W https://bit.ly/2uNMjwR https://bit.ly/2GDhH2E https://bit.ly/2uQ3YE5 https://bit.ly/2H0uoHZ http://www.jtv.com/library/hackmanite-facts.html http://www.gemologyonline.com/hackmanite.html http://www.mindat.org/min-1789.html More on tenebrescence: http://bit.ly/1N3RDsj http://bit.ly/1MxlTi4 http://bit.ly/1T9JAiS http://bit.ly/1N8FGWE

Source: facebook.com
#Hackmanite#sodalite#mineral#mineralogy#mineralmonday#color#tenebrescence#sunlight#ultraviolet#the earth story
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