What is "seamanite"

n. (context mineralogy English) An orthorhombic-dipyramidal mineral containing boron, hydrogen, manganese, oxygen, and phosphorus.

Seamanite, named for discoverer Arthur E. Seaman, is a rare manganese boron phosphate mineral with formula Mn[B(OH)](PO)(OH). 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. , seamanite is known from four sites in Michigan and South Australia.