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Smythite

Type Locality
State Route 37 road cut (6), Bloomington, Monroe Co., Indiana, USA
Mineral Data
(Fe,Ni)3+xS4 (x=0-0.3)
Strunz: 
2.CC.10
Physical Properties
Streak: 
dark gray
Hardness: 
4.5
Tenacity: 
brittle