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| Substance | Specific gravity |
|---|---|
| Talc | 2.8 |
| Mica | 2.7-3.1 |
| Kaolin | 2.6 |
| Dolomite | 2.8-2.9 |
| Calcium carbonate | 1.8 |
| Barite | 4.4-4.8 |
| Silica | 2.65 |
| Feldspar | Orthoclase and Microcline 2.44-2.62, Anorthite 2.6-2.8 |
| Graphite | 2-2.5 |
| Quartz | 2.65 |
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