General Information:
Chemical Formula:
MgAl2SiO5(OH)2
Composition:
(Molecular Weight = 220.37 gm)
Magnesium 11.03 % Mg
Aluminum 24.49 % Al
Silicon 12.74 % Si
Hydrogen 0.91 % H
Oxygen 50.82 % O
Empirical Formula:
MgAl2SiO5(OH)2
IMA Status:
Approved IMA
Physical Properties:
Cleavage:
[001] Perfect, [110] Distinct
Color:
greenish gray or greenish black.
Density:
3.5 - 3.6, Average = 3.55
Diaphaniety:
Translucent
Hardness:
6.5 - Pyrite
Luster:
Pearly
Streak:
gray white
More details...