| Nobleite | |
|---|---|
 Nobleite, Death Valley, California | |
| General | |
| Category | Phylloborates |
| Formula | CaB6O9(OH)2·3H2O |
| IMA symbol | Nob1 |
| Strunz classification | 6.FC.05 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/a |
| Identification | |
| Luster | Vitreous2 |
| Streak | White2 |
| Specific gravity | 2.092 |
| Density | 2.092 |
| Ultraviolet fluorescence | Non-fluorescent2 |
| Solubility | Slightly soluble in water2 |
Nobleite is a rare borate mineral with the chemical formula CaB6O9(OH)2·3H2O. It was discovered in 1961, in Death Valley, California, and is named for Levi F. Noble, a USGS geologist, in honor of his contributions to the geology of the Death Valley region.
Nobleite has also been identified at two localities in Chile and Argentina.
References
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- "Nobleite". www.mindat.org. Archived from the original on October 7, 2024. Retrieved 2025-12-22.