Mineralpedia Details for Haynesite
Haynesite
A rare mineral named in honor of Patrick Eugene Haynes, an American geologist and mineral collector/dealer who was the first to find the mineral. Haynesite can be found only at its type locality in the Repete mine near the town of Blanding in San Juan County, Utah, USA. There it occurs in oxidized uranium deposits in mudstones and sandstones. Haynesite is highly radioactive and will fluoresce a yellow-green under short-wave ultraviolet light.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/haynesite.pdf
- Formula
- (UO2)3(Se4+O3)2(OH)2ยท5H2O
- Crystal System
- Orthorhombic
- Crystal Habit
- Tabular, Acicular, Rosette
- Cleavage
- Good, None, None
- Luster
- Vitreous (Glassy)
- Color
- brownish yellow, amber
- Streak
- white
- Class
- Orthorhombic
- Hardness
- 1.5-2
- WebMineral
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- Mindat
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Haynesite from Repete mine, San Juan Co., Utah, United States
- Special Info
- Type Locality
Goldish yellow almost orange platy crystals of Larisaite with yellow bladed, radial Haynesite to about 0.5mm. It is hard to discern the two but as they occur together, the Larisaite appears a darker yellow or orange color.
