Calcite vs Fluorite
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| Property | Calcite | Fluorite |
|---|---|---|
| الصيغة الكيميائية | CaCO3 | CaF2 |
| النظام البلوري | Trigonal | Cubic (Isometric) |
| صنف المعدن | 05 Carbonates and Nitrates | 03 Halides |
| صلادة موس | 3.0 | 4.0 |
| اللون | Colorless, white, yellow, orange, blue, green | Purple, blue, green, yellow, colorless, pink |
| اللمعان | Vitreous | Vitreous |
| لون الخط | White | White |
| الشفافية | Transparent | Transparent |
| الانفصام | Perfect rhombohedral {1011} | Perfect octahedral {111} |
| الكسر | Conchoidal | Conchoidal |
Key Differences
- ◆ Calcite (hardness 3) is scratched by a copper coin; fluorite (hardness 4) requires a steel knife to scratch.
- ◆ Calcite reacts vigorously with dilute HCl; fluorite does not react with HCl.
- ◆ Fluorite has perfect octahedral cleavage (4 directions); calcite has perfect rhombohedral cleavage (3 directions).
- ◆ Fluorite (CaF2) is a halide; calcite (CaCO3) is a carbonate.
- ◆ Fluorite fluoresces under UV light (phenomenon named after it); calcite rarely fluoresces.