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Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has numerous uses. Other polymorphs of calcium carbonate are the minerals aragonite and vaterite . Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C, [ 6 ] [ 7 ] and vaterite is even less stable.
Iceland spar, formerly called Iceland crystal (Icelandic: silfurberg [ˈsɪlvʏrˌpɛrk], lit. ' silver-rock ' ) and also called optical calcite , is a transparent variety of calcite , or crystallized calcium carbonate , originally brought from Iceland , and used in demonstrating the polarization of light .
Cryogenic calcite crystals are loose grains of calcite found on the floors of caves formed by segregation of solutes during freezing of water. Speleogens (technically distinct from speleothems) are formations within caves that are created by the removal of bedrock , rather than as secondary deposits.
Dogtooth spar is a speleothem that consists of large calcite crystals that form through mineral precipitation of water-borne calcite. Dogtooth spar crystals are found in caves, open spaces including veins and fractures, and geodes. They are so named for their resemblance to dog's teeth. [1] The crystals are generally centimeters long, but ...
Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.
"The link between colors and all the mystical arts, such as Tarot, astrology, crystals, and even numerology and dream interpretation, is as ancient as time itself, and the meanings of colors are ...