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Formula: Mn2+3B(OH)4(PO4)(OH)2
Compound phosphate, manganese and boron
bearing mineral
Specific gravity: 3.08
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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