General Information:
Chemical Formula:Y2Fe++Be2Si2O10
Composition:(Molecular Weight = 467.85 gm)Yttrium 38.01 %
Y Beryllium 3.85 %
BeIron 11.94 %
FeSilicon 12.01 %
SiOxygen 34.20 %
O Empirical Formula: Y2Fe2+Be2(Si2O10)
Environment:Pegmatite veins rich in alkaline-earth elements.
IMA Status:Approved IMA 1987
Locality:Kopparberg, Sweden.
Physical Properties: Cleavage:None
Color:brown, green, green black, light green, or black.
Density:4 - 4.5, Average = 4.25
Diaphaniety:Subtransparent to opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., Crystalline - Poor - Occurs primarily as crudely formed crystals., Prismatic - Crystals Shaped like Slender Prism s (e.g. tourmaline).
Hardness:6.5-7 - Pyrite-Quartz
Luminescence:Non-fluorescent.
Luster:Vitreous - Greasy
Streak:greenish gray
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