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Deerite

Type Locality
Laytonville Quarry ("Longvale"; "Longvale Quarry"), Laytonville, Coastal Range, Mendocino Co., California, USA
Mineral Data
(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5
Strunz: 
9.DH.60
Physical Properties
Colour: 
Black
Crystal System: 
Monoclinic
Streak: 
Dark gray
Hardness: 
6.0
Tenacity: 
brittle
Photos