Diamante

The diamond-term derives from the greek "adamas" meaning "unconquerable" in reference to the exceptional hardness of this...

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kyanite

Kyanite from greek "kyanos" (deep blue) is a mineral composed of silicon and aluminum. It was formerly called Cleisthenes (dis / two -...

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calcite orange

In mineralogy orange calcite is a calcium carbonate containing iron. The pure calcite is colorless and transparent but acquires shades very...

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