Calcite is a type of mineral that is found in rocks and has a transparent or white appearance. It is often used in making building materials like cement and is also used to polish and make jewelry. Full definition
Rainfall from cyclones contains relatively little heavy oxygen so analysing the oxygen isotope ratio of calcite in stalagmites can reveal the extent of cyclone activity. (environmentalresearchweb.org)
Uranium - series uses the decay of uranium and thorium isotopes (238U, 235U and 232Th) in calcites in particular, such as stalactites and stalagmites in caves. (antarcticglaciers.org)
The final room is filled with hourglasses of crushed blue calcite crystals. (galeriemagazine.com)