General Information: Chemical Formula:Al6Si2O13
Composition:(Molecular Weight = 426.05 gm)
Aluminum 38.00 %
AlSilicon 13.18 %
SiOxygen 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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