| Mineral | Hewettite |
|---|---|
| Formula | CaV6O16 ยท 9H2O |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Color | Deep red; Chocolate brown (on exposure); Red to Orange in transmitted light |
| Density | 2.5 – 2.7 g/cm3 |
| Diaphaneity | Transparent |
| Lustre | Adamantine, Silky |
| Streak | Brownish red |
| Type Loc. | Ragra Mine, Huayllay Dist., Pasco Prov., Pasco Dept., Peru |
| Dana 8 Class | 47.3.1.1 |
| Strunz Class | 4/G.12-40 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 435 |