page_title: Seamanite
section_title: Crystallography
hierarchical_section_title: Seamanite / Crystallography
caption_attribution_description: Français&#160;: gris: hydrogène rouge: oxygène vert: bore violet: manganèse phosphate au centre des tétrèdres jaunes English: Crystal structure of seamanite grey: hydrogen red: oxygen violet: boron center of yellow tetrahedrons: phosphate
context_page_description: Seamanite, named for discoverer Arthur E. Seaman, is a rare manganese boron phosphate mineral with formula Mn₃[B(OH)₄](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.
context_section_description: Seamanite is formed of acicular crystals elongated along [001] and showing the faces {110} and {111} up to one centimeter. It has an orthorhombic crystal system and the Pbnm space group. The parameters of its unit cell are: a=7.811 Å, b=15.114 Å, c=6.691 Å, Z=4 units per unit cell.
caption: Crystal structure of seamanite:
  gray:H red:O green:B violet:Mn center of yellow tetrahedrons:P
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