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Formula: Mn2+3B(OH)4(PO4)(OH)2
Compound phosphate, manganese- and
boron-
bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.08 measured, 3.13 calculated
Hardness: 4
Streak: White
Colour: Yellow, pink, yellow-brown, colourless in transmitted light
Solubility: Soluble in cold, dilute acids
Environments
Localities
At the type locality, the Chicagon mine, Iron county, Michigan, USA, seamanite occurs in
fractures cutting siliceous rock, associated with sussexite,
shigaite and calcite
(HOM. Mindat)
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