Quartz
Quartz
Quartz | |
---|---|
Quartz crystal cluster from Tibet | |
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: trigonal trapezohedral class 3 2; β-quartz: hexagonal 622[1] |
Twinning | Common Dauphine law, Brazil law and Japan law |
Cleavage | {0110} Indistinct |
Fracture | Conchoidal |
Tenacity | Brittle |
Mohs scale hardness | 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 (β tridymite) 1713 °C (β cristobalite)[1] |
Solubility | 1 ppmmass at 400 °C and 500 lb/in2 to 2600 ppmmass at 500 °C and 1500 lb/in2[1] |
Other characteristics | Piezoelectric, pyroelectric, may be triboluminescent |
References | [2][3][4][5] |
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