Andradite

Category  :  Mineral
Hardness  :  6.5 to 7
Gravity  :  3.84 (+/-.03); melanite - 3.90 (+/- .20)
Reflection  :  1.88
Color  :  yellow, green, brown, black
Chemical formula  :  Ca3Fe2(SiO4)3
Crystal system  :  cubic
Major varieties  :  Demantoid

Andradite was named after the Brazilian mineralogist José Bonifácio de Andrade e Silva (1763-1838). It has a hardness of 6.5 to 7. Associated minerals are micas, diopside, chlorite, and serpentine. It is found in Italy, the Ural Mountains of Russia, Arizona and California and in Dnipropetrovsk Oblast in Ukraine.

Demantoid

This is the pale to clear green variety of andradite garnet, regarded as being comparable in luster to diamond; hence the name attributed to it in the latter half of the 19th century. The color varies from a cold, very pale green (almost colorless with a green wash), to a mid or strong green, not as a rule a very lively color and similar to certain shades of green in tourmaline, zircon, or olivine.

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