Meyerhofferite

minerals

inyoite

colemanite

hydroboracite

Formula: CaB3O3(OH)5.H2O
Hydrated borate containing hydroxyl, inderite group
Specific gravity: 2.12
Hardness: 2
Streak: White
Colour: Colourless, white
Solubility: Readily soluble in acids
Environments

Evaporite deposits

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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