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. , seamanite is known from four sites in Michigan and South Australia.
{{Infobox mineral | name = Seamanite | category = Borate minerals | boxwidth = 280px | boxbgcolor = | image = Seamanite-zr17a.jpg | imagesize = 260px | caption = Seamanite crystals on a rock sample(5 x 4 x 3 cm) | formula = Mn3[B(OH)4](PO4)(OH)2 | IMAsymbol = Sem | molweight = 372.64 g/mol | strunz = 6.AC.65 | dana = 43.4.5.1 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pbnm | unit cell = a = 7.811 Å, b = 15.114 Å c = 6.691 Å, Z = 4 | color = yellow, yellow-brown, pink | habit = acicular | twinning = | cleavage = distinct on {001} | fracture = brittle | tenacity = brittle | mohs = 4 | luster = vitreous | polish = | refractive = nα = 1.640, nβ = 1.663, nγ = 1.665 | opticalprop = | birefringence = δ = 0.025 | 2V = ≈40° | dispersion = weak | pleochroism = | fluorescence= none | absorption = | streak = white | gravity = 3.08 | density = 3.08–3.128 g/cm3 | melt = | fusibility = | diagnostic = | solubility = in cold, dilute acids | diaphaneity = transparent | other = | references = }} 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. , seamanite is known from four sites in Michigan and South Australia.
==History== In 1917, Arthur E. Seaman collected a mineral sample from the Chicagon Mine in Iron County, Michigan. He correctly believed it to be a new mineral species based on a qualitative analysis of its composition by F. B. Wilson. World War I delayed further study of the mineral until 1929. A study in 1930 proved it to be a new mineral and named it seamanite in honor of Seaman. They cited his career as a professor of geology and mineralogy and his contributions to the field as reasons for the naming.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).