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Cinnabar
| Chemical Formula | HgS |
| Mohs Hardness | 2-2.5 |
| Specific gravity | 8.0 |
| Description | Cinnabar is generally found in a massive, granular or earthy form and is bright scarlet to brick-red in color, though it occasionally occurs in crystals with a non-metallic adamantine luster. It resembles quartz in its symmetry. It exhibits birefringence, and it has the highest refractive index of any mineral. Structurally, cinnabar belongs to the trigonal crystal system. It occurs as thick tabular or slender prismatic crystals or as granular to massive incrustations. Cinnabar generally occurs as a vein-filling mineral associated with recent volcanic activity and alkaline hot springs. As the most common source of mercury in nature, cinnabar has been mined for centuries, even as far back as ancient Japanese times. |
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