Inyoite
(repeating unit)CaB3O3(OH)5·4H2O IMA symbol Iyo[1] Strunz classification 6.CA.35 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/a Unit cell a = 10.63, b = 12.06
c = 8.4 [Å]; β = 114.03°; Z = 4 Identification Colour Colourless, white on dehydration. Crystal habit Commonly as prismatic to tabular crystals; also in cockscomb aggregates of pseudorhombohedral crystals; coarsely spherulitic or granular Cleavage Good on {001}, distinct on {010} Fracture Irregular/uneven Tenacity Brittle Mohs scale hardness 2 Lustre Vitreous Specific gravity 1.875 Optical properties Biaxial (−) Refractive index nα = 1.495 nβ = 1.505 – 1.512 nγ = 1.520 Birefringence Maximum δ = 0.025 Dispersion Weak References [2][3] 
(same H-M symbol)
c = 8.4 [Å]; β = 114.03°; Z = 4
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(H4B3O7)(OH)·4H2O or CaB3O3(OH)5·4H2O.[3] Associated minerals include priceite, meyerhofferite, colemanite, hydroboracite, ulexite and gypsum.[2][3]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Mindat.org
- ^ a b c Handbook of Mineralogy
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