General Information:
Chemical Formula:
(K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O)
Environment:
Metamorphosed manganese deposit.
Locality:
Harstig mine, Pajsberg, near Persberg, Vermland, Sweden.
Physical Properties:
Cleavage:
[???] Perfect
Color:
brownish yellow or cinnamon brown.
Density:
2.84
Diaphaniety:
Transparent to translucent
Habits:
Foliated - Two dimensional platy forms., Micaceous - Platy texture with "flexible" plates.,
Hardness:
4-4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
brownish yellow
More details...