Trebiskyite

trebiskyite

dickthomssenite

montroseite

corvusite

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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

Sedimentary 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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