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Coesite

Coesite (/ˈkoʊsaɪt/) is a form (polymorph) of silicon dioxide (SiO2) that is formed when very high pressure (2–3 gigapascals), and moderately high temperature (700 °C, 1,300 °F), are applied to quartz. Coesite was first synthesized by Loring Coes, Jr., a chemist at the Norton Company, in 1953.

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2V angle
60–70
Birefringence
+0.006
Category
Tectosilicate minerals
Color
Colorless
Crystal class
Prismatic (2/m) (same H–M symbol)
Crystal habit
Inclusions in UHP metamorphic minerals up to 3 mm in size

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Overview

Occurrences

Crystal structure

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Coesite

Nodes39
Edges38
Triples51
Avg. degree1.95
Density0.051282
Components1

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Coesite

Top relations

related to Occurrences · 15
Coesite → After, Arizona, As, Barringer Crater, Chao, Earth, Edward, Eugene Shoemaker, GPa, In, It, Such UHP, This, UHP, US
related to Crystal structure · 12
Coesite → Although, C2/c, Each, Earth's, No, Pearson, Si, Si4O8, Si8O16, The, There, This
2V angle · 1
Coesite → 60–70
Birefringence · 1
Coesite → +0.006
Category · 1
Coesite → Tectosilicate minerals
Color · 1
Coesite → Colorless
Crystal class · 1
Coesite → Prismatic (2/m) (same H–M symbol)
Crystal habit · 1
Coesite → Inclusions in UHP metamorphic minerals up to 3 mm in size
Crystal system · 1
Coesite → Monoclinic
Density · 1
Coesite → 2.92 (calculated)

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Important terminology

quartz metamorphic rocks crystal pressure eclogite uhp monoclinic silicon formed high structure inclusion pyroxene rim unit cell 70 sio2 polymorph

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Coesite2V angle60–701.00infobox
CoesiteBirefringence+0.0061.00infobox
CoesiteCategoryTectosilicate minerals1.00infobox
CoesiteColorColorless1.00infobox
CoesiteCrystal classPrismatic (2/m) (same H–M symbol)1.00infobox
CoesiteCrystal habitInclusions in UHP metamorphic minerals up to 3 mm in size1.00infobox
CoesiteCrystal systemMonoclinic1.00infobox
CoesiteDensity2.92 (calculated)1.00infobox
CoesiteDiaphaneityTransparent1.00infobox
CoesiteFormula.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:l…1.00infobox
CoesiteFormula mass60.0843 g/mol1.00infobox
CoesiteFractureConchoidal1.00infobox
CoesiteGroupQuartz group1.00infobox
CoesiteIMA symbolCoe1.00infobox
CoesiteLusterVitreous1.00infobox
CoesiteMohs scale hardness7.5-81.00infobox
CoesiteOptical propertiesBiaxial1.00infobox
CoesiteRefractive indexnx = 1.594 ny = 1.595 nz = 1.5991.00infobox
CoesiteSpace groupC2/c1.00infobox
CoesiteStreakWhite1.00infobox
CoesiteStrunz classification4.DA.351.00infobox
CoesiteTenacityBrittle1.00infobox
CoesiteUnit cella = 7.143 b = 12.383 c = 7.143 [Å] β = 120.00° Z = 161.00infobox

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