Amethyst
Amethyst is the variety that is purple of and contains been linked with royalty throughout history. Quartz the most minerals that are common Earth. Other varieties of Quartz include Ametrine and Citrine. Amethyst comes in many different colours, from pale violet to purple that is deep red flashes. Amethyst is a semi-precious stone and is the traditional birthstone for February. The colour arrives to trace quantities of iron impurities included in the silicon dioxide formula that is basic.
Amethyst is available from sources worldwide with notable occurrences in Brazil; Mexico; Namibia; Nigeria; Uraguay; Arizona and Vermont, United States Of America; USSR; and Zambia.
| Category: | Oxide Mineral |
| Chemical Formula: | SiO2 |
| Silicon Dioxide | |
| Molecular Weight: | 60.08 gm |
| Composition: | Silicon | 46.74 % | Si | 100.00 % | SiO2 |
| Oxygen | 53.26 % | O | |||
| 100.00 % | 100.00 % | = TOTAL OXIDE |
| Chemical Formula: | SiO2 |
| Silicon Dioxide | |
| Molecular Weight: | 60.08 gm |
| Composition: | Silicon | 46.74 % | Si | 100.00 % | SiO2 |
| Oxygen | 53.26 % | O | |||
| 100.00 % | 100.00 % | = TOTAL OXIDE |
| Cleavage: | None or [0110] Indistinct |
| Fracture: | Conchoidal |
| Tenacity: | Brittle |
| Moh’s Hardness: | 7.0 |
| Density: | 2.60 – 2.65 (g/cm3) |
| Luminescence: | May be Triboluminescent; varies widely due to traces of impurities. |
| Radioactivity: | Not Radioactive |
| Other: | Piezoelectric and Pyroelectric and may be Triboluminescent |
| Color: | Pale Lilac, Violet, Purple |
| Transparency: | Transparent |
| Luster: | Vitreous (Glassy) |
| Refractive Index: | 1.544 – 1.553 Uniaxial ( + ) |
| Birefringence: | 0.0090 |
| Dispersion: | 0.013 |
| Pleochroism: | Weak |
