General Information:
Chemical Formula:(Ca,Y)6(Al,Fe+++)Si4B4O20(OH)4
Composition:(Molecular Weight = 915.92 gm)Calcium 17.50 %
CaYttrium 19.41 %
Y Aluminum 2.21 %
AlIron 1.52 %
FeSilicon 12.27 %
SiBoron 4.72 %
B Hydrogen 0.44 %
H Oxygen 41.92 %
O Empirical Formula: Ca4Y2Al0.75Fe3+0.25Si4B4O20(OH)4
Environment:Pegmatite
IMA Status:Approved IMA 1987
Locality:Kragero, Telemark, norway.
Physical Properties: Cleavage:None
Color:green yellow, grayish black, reddish brown, or black.
Density:3.7
Diaphaniety:Translucent to subtranslucent
Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., ,
Hardness:5.5 - Knife Blade
Luster:Vitreous - Greasy
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