| Mineral class: | Phosphates |
| Composition: | A5(XO4)3(F,Cl,OH) where A = Ca, Sr, Pb, Na, or K and X = P, As, V, or Si |
| Hardness: | 5 |
| Luster: | Vitreous, Adamantine, Greasy |
| Color: | Varies considerably: Blue, Brown, Colorless, Green, Red, Yellow |
| Streak: | White |
| Cleavage: | Poor |
| Specific Gravity: | 3.16-3.22 |
| Crystal form: | Hexagonal; granular masses |
| Comments: | Fluorescent in UV light. |