General Information:
Chemical Formula:Ca3Fe+++2(SiO4)3
Composition:(Molecular Weight = 508.18 gm)Calcium 23.66 %
CaIron 21.98 %
FeSilicon 16.58 %
SiOxygen 37.78 %
O Empirical Formula: Ca3Fe2+2(SiO4)3
Environment:Igneous and metamorphic rocks.
Locality:Magnet Cove, Arkansas.
Name Origin:Andradite is named after the Brazilian mineralogist J. B. de Andrada e Silva (1763-1838). Demantoid is named after its adamantine luster.
Physical Properties: Cleavage:None
Color:black, yellowish brown, red, greenish yellow, or gray.
Density:3.7 - 4.1, Average = 3.9
Diaphaniety:Transparent to translucent
Habits:Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Euhedral Crystals - Occurs as well-formed crystals showing good external form., Massive - Uniformly indistinguisha ble crystals forming large masses.
Hardness:6.5-7 - Pyrite-Quartz
Luminescence:None.
Luster:Vitreous (Glassy)
Streak:white
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