General Information:
Chemical Formula:Al2O3·(SiO2)1·3-2·((H2O))2·5-3
Composition:(Molecular Weight = 225.11 gm)Aluminum 23.97 %
AlSilicon 16.22 %
SiHydrogen 2.24 %
H Oxygen 57.57 %
O Empirical Formula: (Al2O3)(SiO2)1.3·2.5(H2O)
Name Origin:From the Greek allos - "other" and phanos - "to appear."
Physical Properties: Cleavage:None
Color:white, green, blue, yellow, or brown.
Density:1.9
Diaphaniety:Translucent
Habits:Encrustations - Forms crust-like aggregates on matrix., Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite)., Botryoidal - "Grape-like" rounded form s (e.g.. malachite).
Hardness:3 - Calcite
Luminescence:None.
Luster:Waxy
Streak:white
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