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 Ca3Fe23 with chromium
Demantoid with stilbite
Garnet demantoid - Antetezambato, Ambanja District, Diana (Northern) Region, Antsiranana Province, Madagaskar.
Andradite
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Andradite is a mineral species of the garnet group. It is a nesosilicate, with chemical formula Ca3Fe2Si3O12.
Demantoid
…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…
Single crystal (4.2 cm) – Diakon, Nioro du Sahel Circle, Kayes Region, Mali
Andradite garnet – Jiangxi, Nantan, China.
Black crystals of andradite: melanite