Minerals
TopGeneral Information
Quartz is one of the most abundant minerals in the earths crust and can be found in many different varieties, including: amethyst, aventurine, citrine, tiger eye, rose quarts, jasper and calcedony. Calcedony is a crypto crystaline (a fine internal crystal structure, that doesn't look crystaline) form of quartz. Calcedony has again many variants, including: agate, carnelian, chrysoprase and onyx. Calcedony is a semi-precious gemstone.[1]
TopChemical & Physical Information
| Trivial Name | Quartz |
| Chemical Name | Silicon Dioxide |
| Chemical Formula | SiO2 |
| Density | 2,65 g·cm-3 |
| Molar mass | - |
| Hardness | 7 |
| Crytal system | Rhombohedral |
| Unit cell | ? |
| Crystal habit | 6-sided prism with 6-sided pyramids as end. |
| Fracture | Conchoidal |
| Cleavage | None |
| Colour | Transparant |
| Luster | Glass |
| Streak | White |
| Opacity | Transparent |
| Safety | Safe |
| Extra | Piezoelectric |
Photos
(4 cm)
(2 cm)
(7 cm)
(5 cm)
(3 cm)
(3 cm)
(1 cm)
(2 cm)
(3 cm)
Sources
[1] Wikipedia
[2] Specimen from my personal collection, photo taken by me.
