Apatite (blue, yellow,green)
| Feature | Specification |
| Chemical Formula | Ca₅(PO₄)₃(F,Cl,OH) |
| Color | Colorless, green, blue, yellow, or purple |
| Hardness | 5 on the Mohs scale |
| Density | 3.1–3.2 g/cm³ |
| Luster | Vitreous (glassy) |
| Crystal System | Hexagonal |
| Cleavage | Poor to imperfect |
| Transparency | Transparent to translucent |
| Occurrence | Found in igneous, sedimentary, and metamorphic rocks |
| Uses | Fertilizers, gemstone, industrial applications |