22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix
22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix 22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix 22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix 22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix 22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix 22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix 22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix

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22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix

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Species
Calcite Geode with Gypsum Crystal
Age
-
Location
South Morocco
Formation
-
Size
142.6 mm   •    in
Weight
680 g   •    oz
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Description

SIZE: 142.6 mm  //  5.61 in

WEIGHT: 680 g

- Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as "calcite".
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 and vaterite is even less stable.

- Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall. A massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England. Gypsum also crystallizes as translucent crystals of selenite. It also forms as an evaporite mineral and as a hydration product of anhydrite.

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