Quartz

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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]

Quartz


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. 1.0 1.1 1.2 Deer, W. A., R. A. Howie and J. Zussman, An Introduction to the Rock Forming Minerals, Logman, 1966, pp. 340-355 ISBN 0-582-44210-9
  2. Handbook of Mineralogy. Quartz
  3. Mindat. Quartz
  4. Webmineral. Quartz
  5. Hurlbut, Cornelius S.; Klein, Cornelis (1985). Manual of Mineralogy (20 ed.). ISBN 0-471-80580-7.