Biotite vs Malachite
| Property | Biotite | Malachite |
|---|---|---|
| Formula | K(Mg,Fe)3(AlSi3O10)(OH)2 | Cu2(CO3)(OH)2 |
| Crystal System | Monoclinic | Monoclinic |
| Mineral Class | 09 Silicates | 05 Carbonates and Nitrates |
| Mohs Hardness | 2.5-3.0 | 3.5-4.0 |
| Color | Black, dark brown, dark green | Bright green, dark green |
| Luster | Vitreous | Vitreous |
| Streak | White to gray | Light green |
| Transparency | Translucent | Translucent |
| Cleavage | Perfect basal {001} | Perfect {201} |
| Fracture | Uneven | Subconchoidal to uneven |