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Mineralpedia Details for Uranophane

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Uranophane

Uranophane

Sometimes referred to as Uranophane-alpha, Uranophane is named for its uranium content and for the Greek word phainesthai, meaning “to appear” as its composition was originally under some scrutiny as being accurate. Uranophane is quite common, a secondary mineral in uranium deposits and formed by the alteration of uraninite. It can also be found “as coatings, presumably through deposition from meteoric waters.” There are hundreds of worldwide localities, but only a few have excellent crystals or large quantities. Uranophane is highly radioactive. Crystals will fluoresce weakly under ultraviolet light, but massive Uranophane is typically not fluorescent.

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

Formula
Ca(UO2)2SiO3(OH)2*5(H2O) 
Crystal System
Monoclinic 
Crystal Habit
Radial, Earthy, Massive - Fibrous 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, yellow brown, yellow green, yellow orange, light yellow 
Streak
yellowish white 
Class
Monoclinic - Sphenoidal 
Fracture
Uneven 
Hardness
2.5 
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Uranophane from Valentine, Presidio Co., Texas, United States

Uranophane
            from Valentine, Presidio Co., Texas, United States 2.5mm canary yellow radial spray of bladed crystals.
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Uranophane from Madawaska Mine, Bancroft, Ontario, Canada

Uranophane
            from Madawaska Mine, Bancroft, Ontario, Canada Light yellow, straw-like sprays of fibrous crystals to 1cm.
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Uranophane from Freedom #1 Claim, Pinto Co., Utah, United States

Uranophane
            from Freedom #1 Claim, Pinto Co., Utah, United States Bright yellow acicular crystals to 0.75mm.
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Uranophane from Faraday mine, Hastings Co., Ontario, Canada

Uranophane
            from Faraday mine, Hastings Co., Ontario, Canada

Large, canary yellow fibrous crystal sprays to 1cm.

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Uranophane from Zobes, Vogtland, Germany

Uranophane
            from Zobes, Vogtland, Germany Glassy, bright, yellow, prismatic crystals in radial sprays - to 2mm.
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Uranophane from Margaritas mine, Sierra Peña Blanca, Chihuahua, Mexico

Uranophane
            from Margaritas mine, Sierra Peña Blanca, Chihuahua, Mexico

Bright yellow sprays of Uranophane to 1mm.

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Uranophane from Grants dist., McKinley Co., New Mexico, United States

Uranophane
            from Grants dist., McKinley Co., New Mexico, United States

Bright yellow long acicular or fibrous crystals in groups to 2cm. Excellent specimen!

Click thumbnail images for larger view.

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