General Information:
Chemical Formula:
Al6Si2O13
Composition:
(Molecular Weight = 426.05 gm)
Aluminum 38.00 % Al
Silicon 13.18 % Si
Oxygen 48.82 % O
Empirical Formula:
Al6Si2O13
Environment:
Remelted Tertiary-aged clays.
Locality:
Isle of Mull, Scotland, England.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[010] Good
Color:
colorless, violet, yellow, white, or light pink.
Density:
3 - 3.1, Average = 3.05
Diaphaniety:
Transparent to translucent
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
6-7 - Orthoclase-Quartz
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
white
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