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Topaz

Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al2SiO4(F, OH)2. It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden-brown to yellow-orange. Topaz is often treated with heat or radiation to make it a…

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Birefringence
δ = 0.010
Category
Nesosilicate
Cleavage
Perfect
Color
Colorless (if impurities are absent), white, blue, brown, orange, gray, yellow, yellowish brown, green, pink, reddish pink, or even red
Crystal class
Dipyramidal (mmm) H–M symbol: (2/m 2/m 2/m)
Crystal habit
Prismatic crystal

Topics to explore

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Overview

Etymology

History

Gemstone

Structure

Characteristics

Localities and occurrence

Mining

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Map overview Semantic statistics

Topaz

Nodes84
Edges83
Triples128
Avg. degree1.98
Density0.02381
Components1

How this topic connects Entity context

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Topaz

Top relations

related to Localities and occurrence · 40
Topaz → Afghanistan, Anns, Aurangzeb, Australia, Brazil, Brazilian, Chivinar, Colorless, Czech Republic, Flinders Island, Germany, Ilmensky, It, Italy, Japan, Jean Baptiste Tavernier, Large, Llano Uplift, Mason County, Mexico
related to Etymology · 23
Topaz → Alexander Polyhistor, Alternatively, Ancient Sri Lanka, Egypt, Egyptians, Greece, Greek, John's Island, Latin, Old French, Pliny, Red Sea, Sanskrit, St, Tamraparni, The, This, Topace, Topapwene, Topazius
related to Mining · 10
Topaz → After, Deforestation, In, Large-scale, Mined, Mining, Tailings, The, These, Water
related to history · 8
Topaz → Bible, However, In, King James Version, Many English, Middle Ages, Septuagint, Thomas Nicols
related to External links · 6
Topaz → Encyclopædia Britannica, International Colored Gemstone AssociationTopaz, Juab County, Topaz Mountain, Utah Geological Survey, Vol
is a · 5
Topaz → colorless topaz that has been artificially coated via a vapor deposition process giving it a rainbow effect on its surface.Although very hard, nesosilicate mineral, part of the second rank of gemstones, silicate mineral made of aluminum and fluorine with the chemical formula Al2SiO4, state gemstone of the US state of Texas
related to Structure · 5
Topaz → Al3, Fluorine, OH, Si4, The
related to Characteristics · 4
Topaz → Also, It, Likewise, The
related to Gemstone · 4
Topaz → In, Lower, The, Using
Birefringence · 1
Topaz → δ = 0.010

Important terminology Word statistics

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Important terminology

gemstone also yellow blue mineral mining used colorless make pink believed found pale often red crystal material stones large state

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
TopazBirefringenceδ = 0.0101.00infobox
TopazCategoryNesosilicate1.00infobox
TopazCleavagePerfect1.00infobox
TopazColorColorless (if impurities are absent), white, blue, brown, orange, gray, yellow, yellowish brown, green, pink, reddish pink, or even red1.00infobox
TopazCrystal classDipyramidal (mmm) H–M symbol: (2/m 2/m 2/m)1.00infobox
TopazCrystal habitPrismatic crystal1.00infobox
TopazCrystal systemOrthorhombic1.00infobox
TopazDiaphaneityTransparent1.00infobox
TopazFormula.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
TopazFractureSubconchoidal to uneven1.00infobox
TopazIMA symbolTpz1.00infobox
TopazLusterVitreous1.00infobox
TopazMohs scale hardness8 (defining mineral)1.00infobox
TopazOptical propertiesBiaxial (+)1.00infobox
TopazPleochroismWeak in thick sections X = yellow; Y = yellow, violet, reddish; Z = violet, bluish, yellow, pink1.00infobox
TopazRefractive indexnα = 1.606–1.629 nβ = 1.609–1.631 nγ = 1.616–1.6381.00infobox
TopazSpace groupPbnm1.00infobox
TopazSpecific gravity3.49–3.571.00infobox
TopazStreakGrayish White1.00infobox
TopazStrunz classification9.AF.351.00infobox
TopazTwinningRarely on1.00infobox
TopazUltraviolet fluorescenceGolden yellow under short UV; cream under long UV1.00infobox
TopazUnit cella = 4.65 Å, b = 8.8 Å, c = 8.4 Å; Z = 41.00infobox
Topazis asilicate mineral made of aluminum and fluorine with the chemical formula Al2SiO40.90text
Topazis anesosilicate mineral0.90text
Topazis apart of the second rank of gemstones0.90text
Topazis astate gemstone of the US state of Texas0.90text
Topazis acolorless topaz that has been artificially coated via a vapor deposition process giving it a rainbow effect on its surface.Although very hard0.90text

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