Wednesday, September 4, 2013

Calcite

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The other polymorphs are the minerals aragonite and vaterite. Aragonite will change to calcite at 380-470°C, and vaterite is even less stable.

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Nine holes

  Nine holes is a two-player abstract strategy game from different parts of the world and is centuries old. It was very popular in Englan...