carbonates

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calcite from Russia emerald cut

calcite

It is known since antiquity, its name comes from the Greek “khalx” for lime. Identified and analyzed from the seventeenth century and then by Rene-Just Haüy to its easy cleavage. Called Iceland spar, the crystals exhibit the phenomenon of double images: a feature seen through

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bastnaesite from Zagi in Pakistan

bastnaesite

It takes its name from the mine Bastnas Riddarhyttan in Vastmanland in Sweden where it was discovered. There are three varieties of bastnaesite based on the predominant “rare earth element” (rare metallic chemical elements) in it. Here lanthanum is the dominating but also cerium can

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barytocalcite crystals of Mont St.-Hilaire, Canada

barytocalcite

Discovered in 1824 in England, it was named after its composition, it contains barium as much as barite and it is a carbonate (calcium, as calcite, but with the addition of barium).

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azurite from Morocco oval cut

azurite

Discovered in 1824 by Beudant Chessy-les-Mines in France, azurite takes its name from its azure blue. It has been known since antiquity, it is a copper carbonate, which effervesces with acids. It is often associated with malachite, green, in copper deposits, as azurite turns into

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yellow aragonite of Czech Republic cushion cut

aragonite

Its name comes from the Spanish region of Aragon, Castille. Identified by Werner in 1797 is a calcium carbonate, like calcite, but crystallizes in another crystal system.

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