Classification of Quartz |
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IMA status: | Approved |
Validity of Species: | A valid mineral species |
Strunz ID: | 4/D.01-10
4 : Oxides & Hydroxides D : Oxides with metal : oxygen = 1:2 (MO2 and related compounds) 01 : Quartz group |
Dana ID: | 75.1.3.1 |
Hey's CIM Ref.: | 7.8.1 |
mindat.org URL: | http://www.mindat.org/min-3337.html Please feel free to link to this page. |
Occurrences of Quartz |
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Geological Setting: | Most of them... |
Industrial Uses: | Ore for silicon, glassmaking, frequency standards, optical instruments. Major component of sand. |
Physical Properties of Quartz |
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Lustre: | Vitreous |
Diapheny: | Transparent,Translucent |
Colour: | Colorless, Purple, Rose, Black, Yellow, Brown, Green, Orange, etc. |
Streak: | White |
Hardness (Mohs') | 7 |
Hardness Data: | Mohs' hardness reference species |
Tenacity: | Brittle |
Cleavage: | None Observed |
Fracture: | Conchoidal |
Density (measured): | 2.65 - 2.66 g/cm3 |
Density (calculated): | 2.66 g/cm3 |
Crystallography of Quartz |
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Crystal System: | Trigonal |
Class (H-M): | 3 2 - Trapezohedral |
Space Group: | P31 2 1 |
Cell Parameters: | a = 4.9133, c = 5.4053
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Ratio: | a:c = 1 : 1.1 |
Z: | 3 |
Morphology: | Typically long prismatic with steep pyramidal terminations, but may be short prismatic to nearly bipyramidal; fibrous (agate & chalcedony) |
Twinning: | Dauphine law.
Brazil law.
Japan law.
Others for beta-quartz...
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X-Ray Powder Diffraction Data for Quartz |
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X-Ray Data: | 4.527(20)
3.324(10)
2.457(10)
2.282(10)
2.127(10)
1.8179(10)
1.5418(10)
1.3718(10) |
Optical Data of Quartz |
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Type: | Uniaxial (+) |
RI values | nω=1.543 - 1.545 nε=1.552 - 1.554 |
Maximum Birefringence: | δ=0.009
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
Surface Relief: | Low |
Relationship of Quartz to other Species |
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Associates: | |
Related Minerals (Strunz Grouping): | |
Chemical Properties of Quartz |
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Formula: | |
Elements: | |