Seamanite

seamanite

sussexite

shigaite

manganese

Images

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

Igneous 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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