a mineral, calcium-iron garnet, Ca 3 Fe 2 Si 3 O 2 , occurring in brown, green, or black crystals.
Historical Examples

andradite garnet furnishes brilliant green stones, which have been incorrectly named “Olivines” by the trade.
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Frank Bertram Wade

The andradite garnets furnish the brilliant, nearly emerald green demantoids (so often called “olivine” by the trade).
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Frank Bertram Wade

a yellow, green, or brownish-black garnet that consists of calcium iron silicate and is used as a gemstone. Formula: Ca3Fe2(SiO4)3


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