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Formula: {(NH4)4Na2(H2O)10}{V10O28}
Ammonium-bearing decavanadate
Specific gravity: 2.461 calculated
Hardness: 2
Streak: Yellow
Colour: Orange
Luminescence: Does not fluoresce under UV
Solubility: Dissolves instantly in cold, dilute hydrochloric acid, and slowly in water
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the type locality, the Saint Jude Mine, Slick Rock Mining District, San Miguel County, Colorado, USA,
schindlerite is rare. It was found growing on
corvusite-montroseite-bearing
sandstone blocks and closely associated with
calciodelrioite, gypsum,
huemulite, hughesite,
metarossite, pascoite and
rossite. Other minerals found in the same area in the mine include
wernerbaurite, delrioite,
hendersonite, nashite and
powellite.
The minerals form from the oxidation of
corvusite-montroseite
assemblages in a moist environment. Mining operations have exposed unoxidised and oxidised phases. Under ambient
temperatures and generally oxidising near-surface environments, water reacts with
pyrite in the deposit to form aqueous solutions with relatively low pH (acid).
The various secondary
vanadate phases that formed depend upon the ambient conditions and on the
presence of other cations such as Na+, Ca2+, Mg2+ and Al3+.
Crystals of schindlerite are tabular and often occur in stacked parallel intergrowths. Individual crystals are
up to 0.3 mm in size
(CM 51.297-312).
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