| Mineral class: | Sulfate |
| Composition: | Strontium sulfate, SrSO4 |
| Hardness: | 3 - 3.5 |
| Luster: | Glassy |
| Color: | White, blue, red |
| Cleavage: | Perfect cleavage in 2 directions at right angles. Imperfect cleavage in third direction. |
| Crystal form: | Sometimes radiating white or pink fibers. |
| Comments: | Scratched by knife but not penny or fingernail. Similar to barite in appearance and occurrence, except Celestite turns red in a flame test while barite is green. |