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Mineralpedia Details for Haiweeite

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Haiweeite

Haiweeite

Named for the type locality near the Haiwee reservoir in the Coso Mountains in Inyo County, California, USA. Haiweeite is a rare mineral that can be found in additional localities in Brazil, Argentina, and Austria, among a few others. Haiweeite occurs in the surfaces of fractures in granites as well as in voids in nearby lakebed sediments at its locality in the Coso Mountains, and along fractures in tourmaline-bearing granites and granite pegmatites in a Brazilian locality at Perus. Haiweeite will dully fluoresce a dull green under ultraviolet light. It is strongly radioactive.

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

Formula
Ca(UO2)2Si5O12(OH)2ยท3H2
Crystal System
Orthorhombic 
Crystal Habit
Microscopic Crystals, Spherical, Aggregates 
Cleavage
Good, None, None 
Luster
Pearly 
Color
greenish yellow, light yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
3.5 
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Haiweeite from Teofilo Otoni, Minas Gerais, Southeast Region, Brazil

Haiweeite
            from Teofilo Otoni, Minas Gerais, Southeast Region, Brazil

Bright yellow acicular radial sprays to 3mm across.

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Haiweeite from Mammoth mine, Jeff Davis Co., Texas, United States

Haiweeite
            from Mammoth mine, Jeff Davis Co.,  Texas, United States

Smooth yellow balls of Haiweeite with glassy yellow prismatic crystals of Uranophane. This is old material from the DeVito collection we finally got aroound to splitting up. Haiweeite is a relatively rare mineral.

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