General Information:
Chemical Formula:(Fe++,Mn)8Si6O15(Cl,OH)10
Environment:Metamorphosed iron ores.
IMA Status:Approved IMA
Locality:Nordmark in Vermland and at Dannemora, in Upsala, Sweden.
Name Origin:Iron rich end member of pyrosmalite.
Physical Properties: Cleavage:[0001] Good
Color:green blackish, pale liver brown, or gray.
Density:3.06 - 3.19, Average = 3.12
Diaphaniety:Translucent to subtranslucent
Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Massive - Fibrous - Distinctly fibrous fine-grained forms.,
Hardness:4.5 - Between Fluorite and Apatite
Luster:Vitreous (Glassy)
Streak:light green
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