Tags: Chemical Substance, Mineral.

Demantoid is the green gemstone variety of the mineral andradite a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca3Fe2(SiO4)3 with chromium substitution as the cause of the demantoid green color.

Demantoid_-_Mineralogisches_Museum_Bonn_(7301).jpg

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