Calcite vs Wollastonite
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| Property | Calcite | Wollastonite |
|---|---|---|
| Formule | CaCO3 | CaSiO3 |
| Système Cristallin | Trigonal | Triclinic |
| Classe Minérale | 05 Carbonates and Nitrates | 09 Silicates |
| Dureté Mohs | 3.0 | 4.5-5.0 |
| Couleur | Colorless, white, yellow, orange, blue, green | White, gray, very pale green |
| Éclat | Vitreous | Vitreous |
| Trait | White | White |
| Transparence | Transparent | Translucent |
| Clivage | Perfect rhombohedral {1011} | Perfect {100} |
| Cassure | Conchoidal | Uneven |
Key Differences
- ◆ Wollastonite (CaSiO3) is formed by metamorphic reaction of calcite with quartz: CaCO3 + SiO2 → CaSiO3 + CO2.
- ◆ Wollastonite does not react with HCl; calcite effervesces vigorously.
- ◆ Wollastonite (hardness 4.5–5) is harder than calcite (hardness 3).
- ◆ Wollastonite is white to pale gray with vitreous to silky luster; calcite is highly variable in color.
- ◆ Wollastonite is industrially used as a ceramic filler; calcite is used in lime production.