Tags: Chemical Substance, Mineral.
Seamanite named for discoverer Arthur E. Seaman is a rare manganese boron phosphate mineral with formula Mn3[B(OH)4](PO4)(OH)2. The yellow to pink mineral occurs as small needle-shaped crystals. It was first discovered in 1917 from a mine in Iron County Michigan United States and identified in 1930. As of 2012 seamanite is known from four sites in Michigan and South Australia.
