| Gewicht | 0,11 kg (110 gr) |
|---|---|
| Dimensions | 5.5 × 4 × 4.5 cm |
| Sales Unit | |
| Type | |
| Form | |
| Origin | |
| SKU | 166 |
Rock Crystal Skull | 5.5 cm
Sales unit: Per unit
Rock crystal
Rock crystal is the colourless, transparent variety of quartz and consists of pure silicon dioxide. It crystallises in the trigonal crystal system and often forms well-developed six-sided prisms with a pointed tip. Owing to its clarity and vitreous lustre, rock crystal is one of the best-known and most widely used varieties of quartz.
The mineral occurs worldwide, with important deposits in Brazil, Madagascar, Switzerland and the United States, among others. Rock crystal occurs in hydrothermal veins, pegmatites and metamorphic rocks. Its chemical formula is SiO₂ and its hardness is 7 on the Mohs scale. Well-known varieties of quartz such as rose quartz, amethyst and smoky quartz differ from rock crystal by their colour-causing inclusions or radiative influences.
Sources:
Mindat.org, Gemdat.org, Wikipedia – Quartz
