Calcium fluoride
Calcium fluoride is the inorganic compound of the elements calcium and fluorine with the formula CaF2. It is a white solid that is practically insoluble in water. It occurs as the mineral fluorite (also called fluorspar), which is often deeply coloured owing to impurities.
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3D model (JSmol) |
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| ChemSpider | |||
| ECHA InfoCard | 100.029.262 | ||
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| Properties | |||
| CaF2 | |||
| Molar mass | 78.075 g·mol−1 | ||
| Appearance | White crystalline solid (single crystals are transparent) | ||
| Density | 3.18 g/cm3 | ||
| Melting point | 1,418 °C (2,584 °F; 1,691 K) | ||
| Boiling point | 2,533 °C (4,591 °F; 2,806 K) | ||
| 0.015 g/L (18 °C) 0.016 g/L (20 °C) | |||
Solubility product (Ksp) |
3.9 × 10−11 | ||
| Solubility | insoluble in acetone slightly soluble in acid | ||
| -28.0·10−6 cm3/mol | |||
Refractive index (nD) |
1.4338 | ||
| Structure | |||
| cubic crystal system, cF12 | |||
| Fm3m, #225 | |||
a = 5.451 Å, b = 5.451 Å, c = 5.451 Å α = 90°, β = 90°, γ = 90° | |||
| Ca, 8, cubic F, 4, tetrahedral | |||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards |
Reacts with concentrated sulfuric acid to produce hydrofluoric acid | ||
| NFPA 704 (fire diamond) | |||
| Flash point | Non-flammable | ||
| Lethal dose or concentration (LD, LC): | |||
LDLo (lowest published) |
>5000 mg/kg (oral, guinea pig) 4250 mg/kg (oral, rat) | ||
| Safety data sheet (SDS) | ICSC 1323 | ||
| Related compounds | |||
Other anions |
Calcium chloride Calcium bromide Calcium iodide | ||
Other cations |
Beryllium fluoride Magnesium fluoride Strontium fluoride Barium fluoride | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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