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Formula: CaB3O3(OH)5.H2O
Hydrated borate containing hydroxyl, inderite group
Crystal System: Triclinic
Specific gravity: 2.12 measured, 2.116 calculated
Hardness: 2
Streak: White
Colour: Colourless, white
Solubility: Readily soluble in acids
Environments
Meyerhofferite occurs typically as a minor component of sedimentary or lake-bed borate deposits, associated with
inyoite, colemanite,
hydroboracite and ulexite
(HOM).
Localities
At Monte Azul, Plano, Argentina, meyerhofferite forms pseudomorphs after
inyoite
(KL p183).
At the Qaragol boron mine, Zanjan province, Iran, The major mineral in the Qaragol borate deposits is
hydroboracite, with minor presence of other borates such as
colemanite, inyoite,
meyerhofferite and szaibélyite. The meyerhofferite is associated
with inyoite and colemanite
(92.6.542-544).
The type locality is the Monte Blanco mine, Black Mountains, Amargosa Range, Inyo county, California, USA.
Alteration
Meyerhofferite occurs principally as an alteration product of the dehydration of inyoite,
and forms pseudomorphs after it
(Mindat, Webmin).
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