Twinned staurolite in thin section
SiO2 varieties
camblorite reblogged
Rock Fact #1: The most common mineral in the earths crust isn’t quartz, but feldspar! When you look at a granite it’s the pink and white stuff.
camblorite reblogged
Oddly shaped lava formations look like a mass of twisted bodies in Hawaii shot by Laszlo Kestay (1996)
Erythrites
Erythrite (Co3(AsO4)2.8H2O) is a mineral of the Vivianite group and it occurs as a product of the oxidation of Co-Ni-As minerals. The pink color is due to the presence of cobalt.
- Erythrite from Mont Cobalt, Queensland, Australia.
- Erythrite with Skutterudite from Longotoma, Aconcagua, Chile.
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The Chauvet cave, France, the art of prehistory.
In 1994, three friends discovered in the south of France a cave with magnificent cave paintings, more than 30,000 years old.
Under the ground of the Ardèche region, an invaluable treasure is hidden for its antiquity, its conservation and the pictorial quality of the representations; one of the oldest and most splendid examples of Arieñaciense parietal art, dating approx. between 40,000 and 30,000 B.C.
Diopsides
Diopsides from Canastra 1, Minas Gerais, Brazil.
Diopside (CaMgSi2O6) is a mineral of the pyroxene group and it's commonly found in metamorphic rocks. It forms a complete solid solution series with hedenbergite (CaFeSi2O6).
Sources:
Klein, C., Hurlbut, C. S., & Dana, J. D. (1999). Manual of mineralogy: (after James D. Dana) (21st ed. rev., pp. 481-482). Wiley.
Lamproite with crustal xenolith (the lighter zone), from Murfreesboro, Arkansas, USA.
Lamproite is a potassic to ultramafic, dark-colored igneous rock group.
Xenoliths are rock fragments carried by igneous rocks. They are older and from a different source than the igneous rocks that contain them.
Olivines from dunites from the Mid-Atlantic Ridge.
Olivine is a mineral group with the general formula (Mg,Fe)2SiO4 and usually found in igneous rocks like gabbro, peridotite, basalt, and dunite. It's abundant in the mantle.
Informations from the 21st edition of the Manual of Mineralogy, by Klein and Hurlbut.
Apophyllite on basalt, from Santa Catarina, Brazil, at the University of São Paulo Institute of Geosciences, Brazil.
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Kevin Pages l Fagradalsfjall, Iceland
Lower Cretaceous Ruffordia goeppertii fossil from the Crato Formation, northeast Brazil. Item of the "Fósseis do Araripe" exposition, from the University of São Paulo Museum of Geosciences, Brazil
A echinoderm fossil and a trilobite fossil from Morocco, at the University of São Paulo Institute of Geosciences, Brazil.
Deactivated lead mine, Iporanga-SP, Brazil. In some of the photos is possible to see calcite precipitating.
Testing a speleothem with hydrochloric acid. The calcium carbonate present in the calcite of the rock reacts with this acid and produces bubbles, carbon dioxide gas, water, and calcium chloride.