Aragonite vs Biotite
| Property | Aragonite | Biotite |
|---|---|---|
| Formula | CaCO3 | K(Mg,Fe)3(AlSi3O10)(OH)2 |
| Crystal System | Orthorhombic | Monoclinic |
| Mineral Class | 05 Carbonates and Nitrates | 09 Silicates |
| Mohs Hardness | 3.5-4.0 | 2.5-3.0 |
| Color | Colorless, white, yellow, blue, green | Black, dark brown, dark green |
| Luster | Vitreous | Vitreous |
| Streak | White | White to gray |
| Transparency | Transparent | Translucent |
| Cleavage | Poor {010} | Perfect basal {001} |
| Fracture | Subconchoidal | Uneven |