General Information:
Chemical Formula:
Mg3Al2(SiO4)3
Composition:
(Molecular Weight = 403.13 gm)
Magnesium 18.09 % Mg
Aluminum 13.39 % Al
Silicon 20.90 % Si
Oxygen 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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