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Scheelite

Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. It is an important ore of tungsten (wolfram). Scheelite is originally named after Swedish chemist Carl Wilhelm Scheele (1742–1786). Well-formed crystals are sought by collectors and are occasionally fashioned into gemstones when suitably free of flaws. Scheelite has been…

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Birefringence
δ = 0.017
Category
Tungstate mineral
Cleavage
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Color
Colorless, white, gray, dark brown, brown, tan, pale yellow, yellow-orange, golden yellow, pale shades of orange, red, green, etc.; colorless in transmitted light and may be com…
Crystal class
Dipyramidal (4/m) H-M symbol: (4/m)
Crystal habit
Pseudo-octahedra, massive, columnar, granular

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Overview

Properties

Occurrence

History

Synthetics

Applications

In popular culture

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Map overview Semantic statistics

Scheelite

Nodes103
Edges102
Triples100
Avg. degree1.98
Density0.019417
Components1

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Scheelite

Top relations

related to Occurrence · 39
Scheelite → Arizona, At Trumbull, Australia, Brazil, Caldbeck Fells, Central Otago, China, Connecticut, Cumbria, Currais Novos, Czech Republic, Cínovec, Dead Horse Creek, Dragoon Mountains, Fine, Giant Mountains, Glenorchy, Guttannen, It, Japan
related to Properties · 11
Scheelite → Aside, Colors, Czech Republic, Cínovec, Druzes, Gems, Its, Scheelite's, These, Transparency, Twinning
related to history · 8
Scheelite → Carl Wilhelm Scheele, Dalarna, Mount Bispbergs, Owing, Sweden, Swedes, Säter, The
has application · 7
Scheelite → CRTs, Cryogenic Rare Event Search, In, It, Superconducting Thermometers, The, X-ray
related to Synthetics · 6
Scheelite → Conversely, Distinctly, Gemologists, Natural, Synthetic, The
related to In popular culture · 2
Scheelite → Dr, Stone
Birefringence · 1
Scheelite → δ = 0.017
Category · 1
Scheelite → Tungstate mineral
Cleavage · 1
Scheelite → On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Color · 1
Scheelite → Colorless, white, gray, dark brown, brown, tan, pale yellow, yellow-orange, golden yellow, pale shades of orange, red, green, etc.; colorless in transmitted light and may be com…

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Important terminology

may used also mineral calcium yellow tungstate occasionally white crystals high material diamond crystal tungsten synthetic stone chemical dark golden

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
ScheeliteBirefringenceδ = 0.0171.00infobox
ScheeliteCategoryTungstate mineral1.00infobox
ScheeliteCleavageOn {101}, distinct; on {112}, interrupted; on {001}, indistinct1.00infobox
ScheeliteColorColorless, white, gray, dark brown, brown, tan, pale yellow, yellow-orange, golden yellow, pale shades of orange, red, green, etc.; colorless in transmitted light and may be com…1.00infobox
ScheeliteCrystal classDipyramidal (4/m) H-M symbol: (4/m)1.00infobox
ScheeliteCrystal habitPseudo-octahedra, massive, columnar, granular1.00infobox
ScheeliteCrystal systemTetragonal1.00infobox
ScheeliteDiaphaneityTransparent to opaque1.00infobox
ScheeliteFormulaCaWO41.00infobox
ScheeliteFractureSubconchoidal to uneven1.00infobox
ScheeliteFusibilityWith difficulty1.00infobox
ScheeliteIMA symbolSch1.00infobox
ScheeliteLusterVitreous to adamantine1.00infobox
ScheeliteMohs scale hardness4.5–51.00infobox
ScheeliteOptical propertiesUniaxial (+)1.00infobox
ScheeliteOther characteristicsFluorescence under short-wave UV is bright blue, bluish white to yellow. Specimens with more molybdenum tend to fluoresce white to yellow, similar to powellite. Occasionally, it…1.00infobox
ScheelitePleochroismDefinite dichroic in yellow (yellow to orange-brown)1.00infobox
ScheeliteRefractive indexnω = 1.918–1.921, nε = 1.935–1.9381.00infobox
ScheeliteSolubilitySoluble in alkalis. Insoluble in acids1.00infobox
ScheeliteSpace groupI41/a1.00infobox
ScheeliteSpecific gravity5.9–6.11.00infobox
ScheeliteStreakWhite1.00infobox
ScheeliteStrunz classification7.GA.051.00infobox
ScheeliteTenacityBrittle1.00infobox
ScheeliteTwinningCommon, penetration and contact twins, composition plane {110} or {001}1.00infobox
ScheeliteUnit cella = 5.2429(3), Å c = 11.3737(6) Å; Z = 41.00infobox
Scheeliteis acalcium tungstate mineral with the chemical formula CaWO40.90text

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