meyerhofferite

{{Infobox mineral

| name = Meyerhofferite

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| image = Inyoite-Meyerhofferite-iny04a.jpg

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| category = Nesoborates

| formula = Ca₂B₆O₆(OH)₁₀·2H₂O

| IMAsymbol = Mhf{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|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}}

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| strunz = 6.CA.30

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| system = Triclinic

| class = Pinacoidal ({{overline|1}})
(same H-M symbol)

| symmetry = P{{overline|1}}

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| references = [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Meyerhofferite Mineralienatlas]

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Meyerhofferite is a hydrated borate mineral of calcium, with the chemical formula Ca₂B₆O₆(OH)₁₀·2H₂O,[http://www.webmineral.com/data/Meyerhofferite.shtml Meyerhofferite Webmineral data] CaB₃O₃(OH)₅·H₂O[http://www.handbookofmineralogy.com/pdfs/meyerhofferite.pdf Handbook of Mineralogy] or Ca₂(H₃B₃O₇)₂·4H₂O.[http://www.mindat.org/min-2699.html Mindat with localities] It occurs principally as an alteration product of inyoite, another borate mineral.

Natural meyerhofferite was discovered in 1914 in Death Valley, California It is named for German chemist Wilhelm Meyerhoffer (1864–1906), collaborator with J. H. van't Hoff on the composition and origin of saline minerals, who first synthesized the compound.