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Formula: Y(AsO4)
Anhydrous arsenate, xenotime
group, forms a series with xenotime-(Y),
yttrium-bearing mineral
Specific gravity: 4.866
Hardness: 4 to 5
Streak: White
Colour: Brown, colourless, light yellow
Mildly RADIOACTIVE
Environments
Igneous environments
Pegmatites
Hydrothermal environments
Typically chernovite-(Y) occurs in altered rhyolite, in
pegmatites, or within Alpine-type veins
(MW).
Localities
At Binn, Goms, Valais, Switzerland, chernovite-(Y) occurs in Alpine-type fissures associated with niobium-bearing
rutile, magnetite,
asbecasite and cafarsite
(HOM).
At the type locality, the Nyarta-Syu-Yu River, Tel'pos-Iz Mt, Tyumen Oblast, Russia, chernovite-(Y) occurs
in piemontite veinlets in
rhyolite
porphyry. Associated minerals include
piemontite, molybdenum-bearing
scheelite, albite,
calcite, garnet,
hastingsite, pyrolusite and
hematite
(AM 53.1777, HOM).
At the Alexandra Quarry, Gwynedd, Wales, United Kingdom, minute spots of chernovite-(Y) have been found with
quartz, calcite,
epidote, dravite and
synchysite-(Ce) in green reduction spots in lower Cambrian
slate
(JRS 16.60-63).
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