Inyoite

{{Infobox mineral

| name = Inyoite

| category = Nesoborates

| boxwidth =

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| image = Inyoite-Meyerhofferite-146744.jpg

| imagesize = 260px

| caption =

| formula = CaB₃O₃(OH)₅·4H₂O

| IMAsymbol = Iyo{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| 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 = n_α = 1.495 n_β = 1.505 – 1.512 n_γ = 1.520

| opticalprop = Biaxial (−)

| birefringence = Maximum δ = 0.025

| dispersion = Weak

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| gravity = 1.875

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| references = [http://www.mindat.org/min-2036.html Mindat.org][http://rruff.geo.arizona.edu/doclib/hom/inyoite.pdf Handbook of Mineralogy]

}}

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(H{{sub|4}}B{{sub|3}}O{{sub|7}})(OH)·4H{{sub|2}}O or CaB₃O₃(OH)₅·4H₂O. Associated minerals include priceite, meyerhofferite, colemanite, hydroboracite, ulexite and gypsum.