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Mineralpedia Details for Bayleyite

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Bayleyite

Bayleyite

Named for Professor William Shirley Bayley, former American mineralogist and geologist at the University of Illinois who also worked for the United States Geological Survey.  Bayleyite is a rare mineral that can be found in localities in the United States, Canada, Morocco, Argentina, France, and Israel, among only a few others. It occurs as a coating or efflorescence along with other secondary uranium minerals and may be of post-mine origin, and is found typicality in sediment-hosted uranium deposits. Bayleyite is soluble in water and can rapidly dehydrate when exposed to air. It is quite radioactive and has a weak fluorescence of yellow-green to pastel green under both long-wave and short-wave ultraviolet light.

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

Formula
Mg2(UO2)(CO3)3(H2O)12ยท6H2
Crystal System
Monoclinic 
Cleavage
None, None, None 
Luster
Vitreous - Dull 
Color
yellow, pale yellow, yellowish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
WebMineral
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Mindat
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Bayleyite from Hideout mine, White Canyon dist., San Juan Co., Utah, United States

Bayleyite
            from Hideout mine, White Canyon dist., San Juan Co., Utah, United States

Light yellow acicular crystal sprays to 0.75mm.

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Bayleyite from Poison Canyon mine, Lake Ambrosia dist., McKinely Co., New Mexico, United States

Bayleyite
            from Poison Canyon mine, Lake Ambrosia dist., McKinely Co., New Mexico, United States

Yellow, thin, lath-ilke crystals in groups and fans less than 1mm. I am undecided what the faint yellow material is. Perhaps just gypsum with inclusions.

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