Quartz
| Quartz | |
|---|---|
 Quartz crystal cluster fromTibet | |
| General | |
| Category | Oxide mineral |
| Chemical formula | Silica (silicon dioxide,SiO2) |
| Strunz classification | 04.DA.05 |
| Dana classification | 75.01.03.01 |
| Identification | |
| Color | Colorless through various colors to black |
| Crystal habit | 6-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massive |
| Crystal system | α-quartz:trigonaltrapezohedral class 3 2; β-quartz:hexagonal622[1] |
| Twinning | Common Dauphine law, Brazil law and Japan law |
| Cleavage | {0110} Indistinct |
| Fracture | Conchoidal |
| Tenacity | Brittle |
| Mohs scalehardness | 7 - lower in impure varieties |
| Luster | Vitreous - waxy to dull when massive |
| Streak | White |
| Diaphaneity | Transparent to nearly opaque |
| Specific gravity | 2.65; variable 2.59 - 2.63 in impure varieties |
| Optical properties | Uniaxial (+) |
| Refractive index | nω = 1.543 - 1.545 nε = 1.552 - 1.554 |
| Birefringence | +0.009 (B-G interval) |
| Pleochroism | None |
| Melting point | 1670 °C (βtridymite) 1713 °C (βcristobalite)[1] |
| Solubility | 1 ppmmassat 400 °C and 500 lb/in2to 2600 ppmmassat 500 °C and 1500 lb/in2[1] |
| Other characteristics | Piezoelectric,pyroelectric,may betriboluminescent |
| References | [2][3][4][5] |
Quartz
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Itokasi
[àtúnṣe|àtúnṣe àmìọ̀rọ̀]- ↑1.01.11.2Deer, W. A., R. A. Howie and J. Zussman,An Introduction to the Rock Forming Minerals,Logman, 1966, pp. 340-355ISBN 0-582-44210-9
- ↑Handbook of Mineralogy. Quartz
- ↑Mindat. Quartz
- ↑Webmineral. Quartz
- ↑Hurlbut, Cornelius S.; Klein, Cornelis (1985).Manual of Mineralogy(20 ed.).ISBN0-471-80580-7.