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Formula: Mn2+2Al3(SiO4)(Si2O7)(OH)3
Sorosilicate (Si2O7 groups), manganese-bearing mineral
Crystal System: Monoclinic
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,
parsettensite,
rhodonite,
quartz, albite,
baryte and
manganese-bearing calcite
(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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