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Tephroite

Type Locality
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
Mn2+2SiO4
Strunz: 
9.AC.05
Physical Properties
Crystal System: 
Orthorhombic Forms short prismatic crystals.
Streak: 
Pale gray
Hardness: 
6.0
Tenacity: 
brittle