Quartz
Appearance
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.