General Information:
Chemical Formula:(Mn,Ca,Mg)4(Al,Mn,Fe,Mg)6(As,V,P,Si)(O,OH)4(SiO4)2Si3O10(OH,
Locality:Salmchateau in the Ardennes Mountains, Belgium.
Name Origin:After the locality.
Physical Properties: Cleavage:[010] Perfect, [110] Distinct
Color:yellow, yellow brown, dark brown, orange, or black.
Density:3.62
Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Euhedral Crystals - Occurs as well-formed crystals showing good external form.,
Hardness:6-7 - Orthoclase-Quartz
Luster:Subadamantine
Streak:pale brownish yellow
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