General Information:
Chemical Formula:
Al2O3
Composition:
(Molecular Weight = 101.96 gm)
Aluminum 52.93 % Al
Oxygen 47.07 % O
Empirical Formula:
(Al2O3)
Environment:
Contact and regionally metamorphosed rocks.
Locality:
Tchainit and Yakutia, Russia.
Name Origin:
Probably derived from the Sanskrit, kuruvinda, meaning "ruby."
Physical Properties:
Cleavage:
None
Color:
blue, red, yellow, brown, or gray.
Density:
4 - 4.1, Average = 4.05
Diaphaniety:
Transparent to translucent
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Tabular - Form dimensions are thin in one direction., Prismatic - Crystals Shaped like Slender Prisms ( e.g. tourmaline).
Hardness:
9 - Corundum
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
none
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