|ARAGONITE MINERAL FACTS|
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Aragonite Mineral Facts:
Chemical Formula: CaCO3 (same as Calcite)
Colors: White, gray, yellowish, sometimes green or violet.
3.5 to 4
Cleavage: One distinct cleavage on 010, one poor cleavage on 110, parallel to macropinacoid. Fracture is Subconchoidal ; brittle.
Luster:. Vitreous, transparent to translucent.
Optics: (Refractive Index) a = 1.53; b = 1.68; y = 1.685
Aragonite commonly forms as prismatic crystals, often terminated by acute domes. Very commonly twinned on the face of the prism, and by repetition of this twinning, six sided pseudo- hexagonal crystals are formed. These pseudo-hexagonal twins are distinguished from hexagonal crystals by re-entrant angles. Individual crystals often many times twinned, and with alternately reversed striation on faces of prism and cleavage planes. Also occurs in acicular crystals, often radiating, columnar, and in globular, reniform, stalactitic, striated, and encrusting forms. Aragonite is sometimes deposited from hot springs and can be found sometimes in association with beds of gypsum and some iron oxide deposits, where it may occur in forms resembling coral. It was named for a famous occurrence at Aragon, Spain.
Identification and Diagnostics
Testing for the
presence of Carbonates
SAFETY NOTE ON CHEMICAL TESTS: These tests are given as reference material only. Chemicals can be dangerous and those not well versed in chemistry and the potential hazards of these acids and any other chemical reactions that might occur, should not perform these tests.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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