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| White | Color | 
| 
 | 
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| 80_85 | Transparency | 
| 
 | 
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| 47.1 | Refractive index | 
| 
 | 
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| 2.34 g/Cm3 | Specific gravity | 
| 
 | 
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| 45_100 Kg/m3 | Appearance density | 
| 
 | 
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| 871_1093 C° | Softening point | 
| 
 | 
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| 1260_1343 C° | Melting point | 
| 
 | 
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| 873 J/Kg.K | Specific temperature | 
| 
 | 
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| 0.04_0.06 w/m.k 0.27_0.41 Btu.in/h.ft2.F° | Thermal conductivity at 24 C° | 
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| Soluble in alkaline concentrate and fluoride acid, almost soluble (less than 10%) in caustic soda, normal precipitate, slightly soluble (less than 3%) in mineral acids | Solubility |