General Information:
Chemical Formula:Al2SiO5 = Al[6]Al[5]OSiO4
Composition:(Molecular Weight = 162.05 gm)Aluminum 33.30 %
AlSilicon 17.33 %
SiOxygen 49.37 %
O Empirical Formula: Al2SiO5
Environment:Metamorphosed peri-aluminous sedimentary rocks.
Locality:Andalucia (Spain), an early but now unimportant location.
Name Origin:Named after its locality.
Physical Properties: Cleavage:[110] Distinct, [100] Indistinct, [010] Poor
Color:dark green, gray, brown, red, or green.
Density:3.13 - 3.17, Average = 3.15
Diaphaniety:Transparent to translucent
Habits:Blocky - Crystal shape tends to be equant (e.g. feldspars)., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Euhedral Crystals - Occurs as well-formed crystals sho wing good external form.
Hardness:6.5-7 - Pyrite-Quartz
Luminescence:None.
Luster:Vitreous (Glassy)
Streak:white
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