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Formula: MgB3O3(OH)5.5H2O
Hydrated borate containing hydroxyl,
inderite group, paramorph
of
inderite
Crystal System: Triclinic
Specific gravity: 1.847 to 1.852 measured, 1.855 calculated
Hardness: 2½ to 3
Streak: White
Colour: White, colourless in transmitted light
Solubility: Insoluble in water, soluble in warm acids
Environments
Localities
At the type locality, Deposit No. 33, Inder B deposit and salt dome, Inder, Atyrau Region, Kazakhstan,
kurnakovite
occurs as dense white aggregates as irregular lenses in szaibélyite,
in a
borate deposit
(Mindat).
At the South Meridian claim, Twenty Mule Team Canyon, Furnace Creek Mining District, Inyo county, California, USA,
hungchaoite occurs with
ginorite, mcallisterite,
sborgite, sassolite,
nobleite, ulexite, and, where
gypsum and ulexite are abundant,
with kurnakovite, inderite and
mcallisterite in surficial matrix as products from weathered
colemanite and priceite veins
in late Tertiary (66 million to 2.6 million years ago) rocks
(AM 64.369-375).
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