Sorosilicate (Si2O7 groups)
Specific gravity: 3.256
Streak: Yellowish brown
Colour: Red-brown to copper-red
Common impurities: Ti,Fe,Mg,Ca,Na,K,H2O
Surassite occurs as vein ̄fillings in manganese deposits in low-grade
metasediments, associated with braunite, baryte,
calcite and quartz
At the Woodstock Iron-Manganese mine, Wakefield Parish, Carleton county, New Brunswick, Canada, sursassite occurs in veinlets cutting iron-manganese ores (Dana).
At the type locality, Parsettens Alp, Tinizong, Surses, Albula Region, Grisons, Switzerland, sursassite occurs in cracks in radiolarian chert in the manganese deposits, associated with with tinzenite, parsettonsite, rhodonite, quartz, albite, baryte and manganocalcite (AM 12.380, Dana).
At an unspecified manganese occurrence at George Canyon, Palos Verdes Hills, Palos Verdes peninsula, Los Angeles county, California, USA, sursassite occurs in glaucophane schist (Dana).
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