Derbylite

General Information:
 Chemical Formula:
(Fe+++,Fe++,Ti)7Sb+++O13(OH)
 Name Origin:
Named after the american geologist Orville A. Derby
Physical Properties:
 Cleavage:
None
 Color:
pitch black or black.
 Density:
4.53
 Diaphaniety:
Opaque
 Hardness:
5 - Apatite
 Luster:
Resinous
 Streak:
brownish black
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