inyoite

{{Infobox mineral | name = Inyoite | category = Nesoborates | boxwidth = | boxbgcolor = | image = Inyoite-Meyerhofferite-146744.jpg | imagesize = 260px | caption = | formula = CaB3O3(OH)5·4H2O | IMAsymbol = Iyo | molweight = | strunz = 6.CA.35 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/a | unit cell = a = 10.63, b = 12.06 c = 8.4 [Å]; β = 114.03°; Z = 4 | colour = Colourless, white on dehydration. | habit = Commonly as prismatic to tabular crystals; also in cockscomb aggregates of pseudorhombohedral crystals; coarsely spherulitic or granular | twinning = | cleavage = Good on {001}, distinct on {010} | fracture = Irregular/uneven | tenacity = Brittle | mohs = 2 | lustre = Vitreous | polish = | refractive = nα = 1.495 nβ = 1.505 – 1.512 nγ = 1.520 | opticalprop = Biaxial (−) | birefringence = Maximum δ = 0.025 | dispersion = Weak | pleochroism = | fluorescence= | absorption = | streak = | gravity = 1.875 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = | references = }}

Inyoite, named after Inyo County, California, where it was discovered in 1914, is a colourless monoclinic mineral. It turns white on dehydration. Its chemical formula is Ca(HBO)(OH)·4HO or CaB3O3(OH)5·4H2O. Associated minerals include priceite, meyerhofferite, colemanite, hydroboracite, ulexite and gypsum.