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The Volcano Adventure Guide
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The "Red Beach" near Akrotiri (Photo: Tom Pfeiffer)
A fraction of a second later into the eruption, glowing lava shooting into the air. (Photo: Tom Pfei...
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Large crystal of Calcite on display at the National Museum of Natural History in Washington, DC. With its special property of showing double refraction, it is also known as Icelandic Spar.
Calcite is a very common carbonate mineral and the most stable form of calcium carbonate (CaCO3).
|Color||typically white to colorless; sometimes also gray, yellow, brown, orange, red, green or even blue|
|Luster||vitreous to pearly|
|Crystal habit||crystalline, granular, stalactitic, concretionary, massive, rhombohedral|
|Mohs hardness||3 (definition mineral)|
|Uses||production of lime (industrial scale), acid neutralization, abrasive, soil conditioner, high-grade optical instruments|
Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite at 380–470 °C, and vaterite is even less stable.
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