Mineralpedia Details for 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)2ยท3H2O
- 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
- WebMineral
- View Haiweeite
- Mindat
- View Haiweeite
Haiweeite from Teofilo Otoni, Minas Gerais, Southeast Region, Brazil
Bright yellow acicular radial sprays to 3mm across.
Haiweeite from Mammoth mine, Presido 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.
