Vonsenite

General Information:
 Chemical Formula:
Fe++2Fe+++BO5
 Composition:
(Molecular Weight = 258.35 gm)
Iron 64.85 % Fe
Boron 4.18 % B 
Oxygen 30.96 % O 
 Empirical Formula:
Fe2+2Fe3+BO5
 Locality:
Old City Quarry, Riverside, Riverside Co. California.
Physical Properties:
 Cleavage:
None
 Color:
greenish black or black.
 Density:
4.77
 Diaphaniety:
Opaque
 Hardness:
5 - Apatite
 Luster:
Adamantine - Metallic
 Streak:
black
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