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Formula: CaB3O3(OH)5.4H2O
Hydrated borate containing hydroxyl, inderite group
Crystal System: Monoclinic
Specific gravity: 1.875 measured, 1.87 calculated
Hardness: 2
Streak: White
Colour: Colourless, turning white upon partial dehydration, colourless in transmitted light
Solubility: Soluble in hot water and dilute acids
Environments
Inyoite occurs along fractures and as nodules in sedimentary borate deposits, associated with
meyerhofferite, colemanite,
priceite, hydroboracite,
ulexite and gypsum
(HOM).
Localities
At the Qaragol boron mine, Zanjan province, Iran, inyoite is associated with
meyerhofferite. Microcrystals of colemanite
have been observed between and within the inyoite crystals, and inclusions of inderborite
in the inyoite crystals have been detected by XRD. Large inyoite crystals to 9.5 cm have been found at this locality
(R&M 92.6.542-544).
At the type locality, the Monte Blanco Mine, Black Mountains, Amargosa Range, Inyo county, California, USA, inyoite is associated
with priceite, meyerhofferite and
colemanite (Mindat).
Meyerhofferite pseudomorphs after
inyoite are usual here
(AM 25.549).
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