Quartz Company Profile

Aggregated data from the web about Quartz

Company Name	Quartz
Website	https://qz.com
Snippet	Quartz is a guide to the new global economy for people in business who are excited by change. We cover business, economics, markets, finance, technology, science, design, and fashion.
Color	Colorless through various colors to black
Luster	Vitreous – waxy to dull when massive
Streak	White
Category	silicate mineral[1]
Cleavage	{0110} Indistinct
Fracture	Conchoidal
Tenacity	Brittle
Twinning	Common Dauphine law, Brazil law and Japan law
Unit cell	a = 4.9133 Å, c = 5.4053 Å; Z=3
References	[5][6][7][8]
Solubility	Insoluble at STP; 1 ppmmass at 400 °C and 500 lb/in2 to 2600 ppmmass at 500 °C and 1500 lb/in2[2]
Diaphaneity	Transparent to nearly opaque
Pleochroism	None
Space group	α-quartz: P3221 (no. 154)[3]β-quartz: P6222 (no. 180) or P6422 (no. 181)[4]
Formula mass	60.083 g·mol−1
Birefringence	+0.009 (B-G interval)
Crystal class	α-quartz: trapezohedral (class 3 2); β-quartz: trapezohedral (class 6 2 2)[2]
Crystal habit	6-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massive
Melting point	1670 °C (β tridymite) 1713 °C (β cristobalite)[2]
Crystal system	α-quartz: trigonal β-quartz: hexagonal
Refractive index	nω = 1.543–1.545 nε = 1.552–1.554
Specific gravity	2.65; variable 2.59–2.63 in impure varieties
Optical properties	Uniaxial (+)
Dana classification	75.01.03.01 (tectosilicates)
Mohs scale hardness	7 – lower in impure varieties (defining mineral)
Other characteristics	lattice: hexagonal, Piezoelectric, may be triboluminescent, chiral (hence optically active if not racemic)
Strunz classification	4.DA.05 (oxides)
Formula.mw-parser-output .nobold{font-weight:normal}(repeating unit)	SiO2

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