General Information:
Chemical Formula:
(K,Na)(Fe+++,Al,Mg)2(Si,Al)4O10(OH)2
Physical Properties:
Cleavage:
[001] Perfect
Color:
blue green, green, or yellow green.
Density:
2.4 - 2.95, Average = 2.67
Diaphaniety:
Translucent to Subopaque
Habits:
Micaceous - Platy texture with "flexible" plates., ,
Hardness:
2 - Gypsum
Luminescence:
Non-fluorescent.
Luster:
Earthy (Dull)
Streak:
light green
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