The pyrosmalite group includes:
friedelite:
Mn2+8Si6O15(OH)10
nelenite:
Mn2+16As3+3Si12O36(OH)17
pyrosmalite-(Fe):
Fe2+8Si6O15(OH)10
pyrosmalite-(Mn):
Mn2+8Si6O15(OH,Cl)10
schallerite:
Mn2+16As3+3Si12O36(OH)17
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