Apatite vs Feldspar (Orthoclase)
| Property | Apatite | Feldspar (Orthoclase) |
|---|---|---|
| Formula | Ca5(PO4)3(F,Cl,OH) | KAlSi3O8 |
| Crystal System | Hexagonal | Monoclinic |
| Mineral Class | 08 Phosphates, Arsenates, and Vanadates | 09 Silicates |
| Mohs Hardness | 5.0 | 6.0-6.5 |
| Color | Green, blue, yellow, violet, colorless | White, pink, cream, gray |
| Luster | Vitreous | Vitreous |
| Streak | White | White |
| Transparency | Transparent | Translucent |
| Cleavage | Poor {0001} | Perfect {001}, good {010} |
| Fracture | Conchoidal to uneven | Uneven to conchoidal |