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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