General Information:
Chemical Formula:
Al2O3·(SiO2)1·3-2·((H2O))2·5-3
Composition:
(Molecular Weight = 225.11 gm)
Aluminum 23.97 % Al
Silicon 16.22 % Si
Hydrogen 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
More details...