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Formula: Na3Mg2[TiV9O28].22H2O
Decavanadate,
titanium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.38 measured, 2.352 calculated for the empirical formula and 2.343 calculated for the
ideal formula
Hardness: 2
Streak: Pale yellow
Colour: Translucent yellow
Luminescence: Not fluorescent under UV
Solubility: Readily soluble in water
Environments
Trebiskyite is a new mineral, approved in 2020 and to date (January 2024) reported only from the
type locality.
Localities
At the type locality, the Pickett Corral Mine, Uravan Mining District, Montrose County, Colorado, USA,
trebiskyite was found underground. It crystallised on
asphaltite-bearing
sandstone and
montroseite-corvusite
ore that had been oxidised by percolating meteoric waters rendered acidic by decomposing sulphides. Crystals
of trebiskyite were first identified in March, 2018, by Mr Thomas Trebisky on several specimens
collected from walls of the mine, all of which are closely associated with
lasalite, huemulite,
hummerite,
dickthomssenite and
gypsum. Later, in April, 2019, additional specimens were located on
a previously flooded area of the mine floor that, upon evaporation, produced
sandstone surfaces densely crystallised with
dickthomssenite,
munirite, metamunirite,
rossite, gunterite,
huemulite, grantsite,
hewettite, gypsum and
trebiskyite. Crystals of trebiskyite tend to nucleate on or near a fine-grained greyish to
black-coloured mudstone impregnated with
montroseite and
corvusite.
Crystals of trebiskyite are thin prisms or needles to about 0.3 mm in length occurring as individuals
and in divergent sprays; the crystals are translucent yellow with a vitreous lustre.
(CJMP 62.1.117-132).
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