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Demantoid
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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. Ferric iron is the cause of the yellow in the stone.
Demantoid with stilbite
Demantoid with stilbite
Andradite
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Andradite is a mineral species of the garnet group. It is a nesosilicate, with formula Ca3Fe2Si3O12.
Single crystal (4.2 cm) – Diakon, Nioro du Sahel Circle, Kayes Region, Mali
Single crystal (4.2 cm) – Diakon, Nioro du Sahel Circle, Kayes Region, Mali
Black crystals of andradite: melanite
Black crystals of andradite: melanite