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Mineralpedia Details for Lasalite

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Lasalite

Lasalite

Named for the La Sal district in Utah, USA where the type locality of the mineral at the Vanadium Queen mine is found.  Lasalite is rare mineral that can be found only in the La Sal district in only a couple other mines besides its type locality. It is found “as efflorescences in oxidized portions of paleochannel uranium-vanadium deposits of the Colorado Plateau type.” Lasalite crystals will dehydrate to a tallow powder and are soluble in water.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/lasalite.pdf

Formula
Na2Mg2(V10O28)ยท20H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Efflorescences 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, yellow orange 
Streak
yellow 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
WebMineral
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Mindat
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Lasalite from Vanadium Queen mine, near La Sal, San Juan Co., Utah, United States

Lasalite
            from Vanadium Queen mine, near La Sal, San Juan Co., Utah, United States

Bright fiery orange, to yellowish orange on the far side, efflorescent crusts about 2mm thick on sandstone. There are crystals faces which glisten but no well defined crystals.

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