Photos 1 - 3 from
Wikipedia| Sinter = Calcium precipitation below fountains |
Calcite: CaCO3
birefringent
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Calcite as
building material around an alga cell
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| Egyptian marble alabaster |
2 Echinites
and fossile snail
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Fossile Nummulite
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Coral skeleton
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About limestone (CaCO3)
"Limestone is a sedimentary rock composed largely of the mineral calcite (calcium carbonate: CaCO3)... Limestone is very common in architecture, especially in North America and Europe. Many landmarks across the world, including the pyramids in Egypt, are made of limestone." Marble is generated in nature from limestone under high temperature and pressure.