General Information:
Chemical Formula:
Li2Al4[(Si2AlB)O10](OH)8
Composition:
(Molecular Weight = 511.82 gm)
Lithium 2.71 % Li
Aluminum 26.36 % Al
Silicon 10.97 % Si
Boron 2.11 % B
Hydrogen 1.58 % H
Oxygen 56.27 % O
Empirical Formula:
Li2Al5Si2BO10(OH)8
Environment:
Pegmatites.
Locality:
Antandrokomby, near Mt. Bity on the Manandona River, Madagascar.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[001] Perfect
Color:
colorless or pearl white.
Density:
2.89
Diaphaniety:
Transparent to translucent
Habits:
Micaceous - Platy texture with "flexible" plates., Pseudo Hexagonal - Crystals show a hexagonal outline., Massive - Lamellar - Distinctly foliated fine-grained forms.
Hardness:
2.5-3.5 - Finger Nail-Copper Penny
Luster:
Pearly
Streak:
white
More details...