Seamanite

Infobox mineral
name = Seamanite
category = Phosphate Mineral
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formula = Mn₃(PO₄)B(OH)₆
molweight = 372.64 gm
color = yellow, pink
habit = prismatic
system = Orthorhombic
twinning =
cleavage = distinct on the {001}
fracture = Brittle
tenacity = Brittle
mohs = 4
luster = Vitreous
polish =
refractive =
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birefringence =
dispersion = relatively weak
pleochroism =
fluorescence= None
absorption =
streak = white
gravity =
density = 3.09 g/cm³
melt =
fusibility =
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solubility =
diaphaneity = Transparent
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Seamanite is a very rare manganese boron phosphate, Mn₃(PO₄)B(OH)₆, first discovered in Michigan under the name "koenigite". The only known occurrences have been Iron and Marquette Counties in Michigan, where it forms brown to pink prismatic crystals. It has been found associated with shigaite.

It is named in honor of late Professor Arthur E. Seaman of Michigan Technological University who discovered it.

References

*Heinrich, E. W. "Mineralogy of Michigan" 2nd Ed. (2004)

External links

* [http://www.mindat.org/min-3599.html]
* [http://www.webmineral.com/data/Seamanite.shtml]