Calcite vs Feldspar (Orthoclase)
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| Property | Calcite | Feldspar (Orthoclase) |
|---|---|---|
| Formula | CaCO3 | KAlSi3O8 |
| Crystal System | Trigonal | Monoclinic |
| Mineral Class | 05 Carbonates and Nitrates | 09 Silicates |
| Mohs Hardness | 3.0 | 6.0-6.5 |
| Color | Colorless, white, yellow, orange, blue, green | White, pink, cream, gray |
| Luster | Vitreous | Vitreous |
| Streak | White | White |
| Transparency | Transparent | Translucent |
| Cleavage | Perfect rhombohedral {1011} | Perfect {001}, good {010} |
| Fracture | Conchoidal | Uneven to conchoidal |