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A green to brown or black calcium-iron garnet, Ca3Fe2(SiO4)3.
[After José Bonifácio de Andrada e Silva.]
(Minerals) a yellow, green, or brownish-black garnet that consists of calcium iron silicate and is used as a gemstone. Formula: Ca3Fe2(SiO4)3
[C19: named after J. B. d'Andrada e Silva (1763–1838), Brazilian mineralogist; see -ite1]
a garnet occurring in brown, green, or black crystals.
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|Noun||1.||andradite - a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone|
garnet - any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive
demantoid - a green andradite used as a gemstone