| Mineral | Feynmanite |
|---|---|
| Formula | Na(UO2)(SO4)(OH) ยท 3.5 H2O |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Cleavage | Perfect on {010} |
| Color | Pale greenish yellow |
| Density | 3.3 – 0.0 g/cm3 |
| Diaphaneity | Transparent |
| Fracture | Irregular, Brittle |
| Hardness | 2.0 - |
| Lustre | Vitreous |
| Streak | White |
| Type Loc. | Markey Mine, Red Canyon Dist., White Canyon Dist., San Juan Co., UT, USA |
| Strunz Class | 7.EC.50 |
| Mindat | mindat.org |
| ID | 485 |