General Information: Chemical Formula:Mg3Al2(SiO4)3
Composition:(Molecular Weight = 403.13 gm)
Magnesium 18.09 %
MgAluminum 13.39 %
AlSilicon 20.90 %
SiOxygen 47.63 %
O Empirical Formula: Mg3Al2(SiO4)3
Environment:Ultra basic igneous rocks.
Locality:Zoblitz, Germany.
Name Origin:From the Greek, pyropos, "fiery-eyed" in allusion to the red hue.
Physical Properties: Cleavage:None
Color:blood red, orange red, purple red, pink, or black red.
Density:3.65 - 3.84, Average = 3.74
Diaphaniety:Transparent to subtranslucent
Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., Crystalline - Fine - Occurs as well-formed fine sized crystals., Lamellar - Thin laminae producing a lamellar structure.
Hardness:7.5 - Garnet
Luminescence:None.
Luster:Vitreous (Glassy)
Streak:white
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