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Formula: Mg2Fe3+(PO4)2(OH).2H2O
Hydrated phosphate, phosphoferrite group, forms a series with
kryzhanovskite
Crystal system: Orthorhombic
Specific gravity: 3.16 measured, 3.154 calculated
Hardness: 4
Streak: Brown
Colour: Clove-brown
Common impurities: Mn
Environments
Localities
At the type locality, Rapid Creek, Dawson mining district, Yukon, Canada, members of the
garyansellite-kryzhanovskite series are found in fractures in
an iron formation. Crystals were found in only one outcrop and
have the largest dimension of approximately 1 to 2 mm. On most specimens
garyansellite-kryzhanovskite occurs as plates associated with
ludlamite, arrojadite,
quartz, vivianite,
metavivianite and
souzalite. The sedimentary strata in which these minerals are found is
not metamorphosed, and they apparently were formed at low temperature. The type specimen of garyansellite was
collected on the east side of Rapid Creek, about 1 km north of its junction with Lake Creek
(AM 69.207-209).
Garyansellite from Rapid Creek - Image
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