Sursassite

sursassite

tinzenite

parsettonsite

manganocalcite

Images

Formula: Mn2+2Al3(SiO4)(Si2O7)(OH)3
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
Environments

Metamorphic environments
Hydrothermal environments

Surassite occurs as vein ̄fillings in manganese deposits in low-grade metasediments, associated with braunite, baryte, calcite and quartz (HOM).

Localities

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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