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Quartz

Quartz is a hard mineral composed of silica (silicon dioxide). Its atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen atom being shared between two tetrahedra, giving an overall chemical formula of SiO2. Therefore, quartz is classified structurally as a framework silicate mineral and compositionally as an oxide…

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Key facts & relationships

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Amethyst
Violet
Birefringence
+0.009 (B-G interval)
Category
Tectosilicate minerals
Citrine
Yellow
Cleavage
none
Color
Colorless, pink, orange, white, green, yellow, blue, purple, dark brown, or black

Topics to explore

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Overview

Etymology

Early studies

Crystal habit and structure

Varieties

Piezoelectricity

Occurrence

Mining

Related silica minerals

Safety

Synthetic and artificial treatments

Uses

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Map overview Semantic statistics

Quartz

Nodes173
Edges172
Triples151
Avg. degree1.99
Density0.011561
Components1

How this topic connects Entity context

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Quartz

Top relations

related to External links · 15
Quartz → American History, American Mineralogist, Archived, Hart, Inventors, January, National Museum, Nomenclature, Photos, Silica, Smithsonian Institution, Terminology, The Lemelson Center, The Quartz Watch, Volume
related to Etymology · 14
Quartz → Ancient Greek, Czech, East Central German, German, Middle High German, Polish, Quarz, Querkluftertz, Saxon, Some, The, The Ancient Greeks, Theophrastus, Today
related to Uses · 12
Quartz → Australian Aboriginal, Cameo, Carrowmore, Columbian America, East Asia, Europe, Ireland, It, Middle East, Newgrange, The, While
has treatment · 11
Quartz → Although, Because, Carnelian, Large, Like, Lower Silesia, Not, Poland, Prasiolite, Some, Susceptibility
related to Varieties · 10
Quartz → Chalcedony, Color, Colored, Cryptocrystalline, However, Macrocrystalline, Microcrystalline, Pure, These, Today
related to Early studies · 8
Quartz → Alps, Elder, He, In, Nicolas Steno's, Pliny, Roman, This
is a · 7
Quartz → defining constituent of granite and other felsic igneous rocks, form of silica, hard mineral composed of silica, mineral defining the value of 7 on the Mohs scale of hardness, second most common mineral or mineral group in Earth's lithosphere, six-sided prism terminating with six-sided pyramid-like rhombohedrons at each end, Spruce Pine Mining District in Spruce Pine
related to Crystal habit and structure · 7
Quartz → Above, Both, P3121, P3221, P6222, P6422, The
related to Occurrence · 7
Quartz → Earth's, Generally, Goldich, It, Large, Well-formed, While
related to Related silica minerals · 7
Quartz → Coesite, Earth's, Lechatelierite, Moganite, SiO2, Stishovite, Tridymite

Important terminology Word statistics

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Important terminology

crystal crystals varieties mineral β-quartz silica α-quartz used common rock minerals rocks also sio2 however found temperature since piezoelectric synthetic

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
QuartzAmethystViolet1.00infobox
QuartzBirefringence+0.009 (B-G interval)1.00infobox
QuartzCategoryTectosilicate minerals1.00infobox
QuartzCitrineYellow1.00infobox
QuartzCleavagenone1.00infobox
QuartzColorColorless, pink, orange, white, green, yellow, blue, purple, dark brown, or black1.00infobox
QuartzCrystal classα-quartz: trapezohedral (class 3 2) β-quartz: trapezohedral (class 6 2 2)1.00infobox
QuartzCrystal habit6-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massive1.00infobox
QuartzCrystal systemα-quartz: trigonal β-quartz: hexagonal1.00infobox
QuartzDana classification75.01.03.01 (tectosilicates)1.00infobox
QuartzDiaphaneityTransparent to nearly opaque1.00infobox
QuartzFormulaSiO21.00infobox
QuartzFormula mass60.083 g·mol−11.00infobox
QuartzFractureConchoidal1.00infobox
QuartzGroupQuartz group1.00infobox
QuartzIMA symbolQz1.00infobox
QuartzLusterVitreous – waxy to dull when massive1.00infobox
QuartzMelting point1670 °C (β tridymite); 1713 °C (β cristobalite)1.00infobox
QuartzMilky quartzWhite1.00infobox
QuartzMohs scale hardness7 – lower in impure varieties (defining mineral)1.00infobox
QuartzOptical propertiesUniaxial (+)1.00infobox
QuartzOther characteristicsLattice: hexagonal, piezoelectric, may be triboluminescent, chiral (hence optically active if not racemic)1.00infobox
QuartzPleochroismNone1.00infobox
QuartzRefractive indexnω = 1.543–1.545 nε = 1.552–1.5541.00infobox
QuartzRock crystalClear1.00infobox
QuartzRose quartzPink1.00infobox
QuartzSmoky quartzGray to black, brown1.00infobox
QuartzSolubilityInsoluble at STP; 1 ppmmass at 400 °C and 500 lb/in2 to 2600 ppmmass at 500 °C and 1500 lb/in21.00infobox
QuartzSpace groupα-quartz: P3221 (no. 154) β-quartz: P6222 (no. 180) or P6422 (no. 181)1.00infobox
QuartzSpecific gravity2.65; variable 2.59–2.63 in impure varieties1.00infobox

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