General Information:
Chemical Formula:
Mg2Al(SiAl)O5(OH)4
Composition:
(Molecular Weight = 278.68 gm)
Magnesium 17.44 % Mg
Aluminum 19.36 % Al
Silicon 10.08 % Si
Hydrogen 1.45 % H
Oxygen 51.67 % O
Empirical Formula:
Mg2Al2SiO5OH4
Environment:
Occurs with diaspore.
Locality:
Chester, Hampden Co., Massachusetts, USA.
Physical Properties:
Cleavage:
[001] Perfect
Color:
white or light green.
Density:
2.77
Diaphaniety:
Transparent to translucent
Habits:
Micaceous - Platy texture with "flexible" plates., Foliated - Two dimensional platy forms., Pseudo Hexagonal - Crystals show a hexagonal outline.
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Pearly
Streak:
pale green
More details...