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Topaz

This page kindly sponsored by Norman King
Formula:
Al2(SiO4)(F,OH)2
Colour:
Colourless, white, pale blue, light green, yellow, yellowish brown, or red
Lustre:
Vitreous
Hardness:
8
Specific Gravity:
3.4 - 3.6
Crystal System:
Orthorhombic
Name:
Named after Topasos Island in the Red Sea. In antique times, the name was probably used for the gemstone that is now known as Peridot.
Occurs in pegmatites and high-temperature quartz veins, also in cavities in granites and rhyolites.
A maximum of ~30 % of the F site is occupied by OH in natural topaz, although in some very rare cases OH-dominant members have been described, see Unnamed (OH-analogue of Topaz) (Zhang et al., 2002). A pure synthetic OH analogue of topaz has been synthesised (Wunder et al., 1993).

Visit gemdat.org for gemological information about Topaz.


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Classification of TopazHide

Approved, 'Grandfathered' (first described prior to 1959)
9.AF.35

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.1.1

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
17.2.1

17 : Silicates Containing other Anions
2 : Silicates with fluoride

Pronounciation of TopazHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of TopazHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white, pale blue, light green, yellow, yellowish brown, or red
Streak:
White
Hardness:
Hardness Data:
Mohs hardness reference species
Tenacity:
Brittle
Cleavage:
Perfect
(001)
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.4 - 3.6 g/cm3 (Measured)    

Optical Data of TopazHide

Type:
Biaxial (+)
RI values:
nα = 1.606 - 1.629 nβ = 1.609 - 1.631 nγ = 1.616 - 1.638
2V:
Measured: 48° to 68°, Calculated: 58° to 68°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
noticable r > v
Pleochroism:
Weak
Comments:
In thick sections

X= yellow
Y= yellow, violet, reddish
Z= violet, bluish, yellow, pink

Chemical Properties of TopazHide

Formula:
Al2(SiO4)(F,OH)2
IMA Formula:
Al2SiO4F2

Crystallography of TopazHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 4.65 Å, b = 8.8 Å, c = 8.4 Å
Ratio:
a:b:c = 0.528 : 1 : 0.955
Unit Cell V:
343.73 ų (Calculated from Unit Cell)
Morphology:
Long to short prismatic.
Comment:
Crystallography (orthorhombic or triclinic) depends upon the ratio of F and OH in the mineral.

Crystallographic forms of TopazHide

Crystal Atlas:
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Topaz no.188 - Goldschmidt (1913-1926)
Topaz no.208 - Goldschmidt (1913-1926)
Topaz no.215 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
3.693 (60)
3.195 (66)
3.037 (37)
2.937 (100)
2.3609 (45)
2.1049 (44)
1.6706 (27)

Synonyms of TopazHide

Other Language Names for TopazHide

Arabic:زبرجد
Basque:Topazio
Bosnian (Latin Script):Topaz
Bulgarian:Топаз
Croatian:Topaz
Czech:Topaz
Danish:Topas
Dutch:Topaas
Estonian:Topaas
Finnish:Topaasi
French:Topaze
German:Topas
Hebrew:טופז
Hungarian:Topáz
Italian:Topazio
Japanese:トパーズ
Korean:황옥
Lithuanian:Topazas
Norwegian (Bokmål):Topas
Polish:Topaz
Portuguese:Topázio
Romanian:Topaz
Russian:Топаз
Simplified Chinese:黄玉
托帕石
Slovak:Topás
Slovenian:Topaz
Spanish:Topacio
Traditional Chinese:黃玉
托帕石
Turkish:Topaz
Ukrainian:Топаз

Varieties of TopazHide

Imperial TopazTraditionally imperial topaz was orange in color with red dichroism. Today the definition has expanded to include colors like pinks, reds, lavender pinks and peach pinks but usually excludes yellow or brown.
Killiecrankie DiamondA name used for a variety of Topaz mostly found near Killiecrankie, Flinders Island, Tasmania. The stones were first collected and sold as diamonds in Europe back in the early 1800's. The name is still in common usage, for the location is a popular collec...
PykniteFine grained topaz, occurring in dense aggregates of prismatic to acanthine crystals.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz419 photos of Topaz associated with Quartz on mindat.org.
Albite248 photos of Topaz associated with Albite on mindat.org.
Bixbyite221 photos of Topaz associated with Bixbyite on mindat.org.
Smoky Quartz207 photos of Topaz associated with Smoky Quartz on mindat.org.
Muscovite154 photos of Topaz associated with Muscovite on mindat.org.
Cleavelandite130 photos of Topaz associated with Cleavelandite on mindat.org.
Fluorite110 photos of Topaz associated with Fluorite on mindat.org.
Schorl80 photos of Topaz associated with Schorl on mindat.org.
Elbaite68 photos of Topaz associated with Elbaite on mindat.org.
Microcline67 photos of Topaz associated with Microcline on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AF.05SillimaniteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m)
9.AF.10AndalusiteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.10KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.15KyaniteAl2(SiO4)OTric. 1 : P1
9.AF.20MulliteAl4+2xSi2-2xO10-xOrth. mmm (2/m 2/m 2/m) : Pbam
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.AF.23BoromulliteAl9BSi2O19Orth. mm2 : Cmc21
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)Mon. 2/m : P21/m
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4Mon. 2/m : B2/m
9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.40NorbergiteMg3(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.45Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2Mon. 2/m : P21/b
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
9.AF.45KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2Orth. mmm (2/m 2/m 2/m)
9.AF.55ClinohumiteMg9(SiO4)4F2Mon.
9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon.
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m
9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m : P21/b
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2Orth.
9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth. mmm (2/m 2/m 2/m) : Pbcn
9.AF.75FranciscaniteMn2+6(V5+,☐)2(SiO4)2(O,OH)6Hex.
9.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Hex.
9.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10Hex.
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.2.2PolylithioniteKLi2Al(Si4O10)(F,OH)2Mon. 2/m : B2/b
17.2.3Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2Trig. 3m : P3m1
17.2.5Meliphanite(Ca,Na)2(Be,Al)[Si2O6(OH,F)]Tet. 4 : I4
17.2.6SarcoliteNa4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl)Tet.
17.2.7GötzeniteNaCa6Ti(Si2O7)2OF3Tric. 1 : P1
17.2.8Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5
17.2.9ZinnwalditeKLiFe2+Al(AlSi3O10)(F,OH)2Mon.
17.2.10MagbasiteKBaFe3+Mg7Si8O22(OH)2F6Orth. mmm (2/m 2/m 2/m) : Cmma

Fluorescence of TopazHide

Rarely yellow, white, orange, greenish-yellow

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Gemstone

Topaz in petrologyHide

References for TopazHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Klaproth, M.H. (1810): Chemische Unmtersuchung des Pycnits, Beiträge zur chemischen Kenntniss der Mineralkörper, Fünfter Band, Rottmann Berlin, 50-57
Parise, J.B., Cuff, C., and Moore, F.H. (1980) A neutron diffraction study of topaz: evidence for lower symmetry. Mineralogical Magazine: 43: 943.
B. Wunder, D. C. Rubie, C. R. Ross II, O. Medenbach, F. Seifert & W. Schreyer (1993): Synthesis, stability, and properties of Al2SiO4(OH)2: a fully hydrated analogue of topaz. American Mineralogist, 78, 285–297.
E. E. Foord, L. L. Jackson, J. E. Taggart, J. G. Crock & T. V. V. King (1995): Topaz: environment of crystallization, crystal chemistry, and infrared spectra. Mineralogical Record, 26, 69–71.
Mineralogical Record (1995): 26: 5.
Holfert, J., Mroch, W., and Fuller, J. (1996) A Field Guide to Topaz and Associated Minerals of the Thomas Range, Utah (Topaz Mountain) 1. HM Publishing, Cypress, California.
Extra Lapis No. 13 (1997).
Shinoda, K. and Aikawa, N. (1997) IR active orientation of OH bending mode in topaz. Physics and Chemistry of Minerals: 24: 551-554.
R. Y. Zhang, J. G. Liou & J. F. Shu (2002): Hydroxyl-rich topaz in high-pressure and ultrahigh-pressure kyanite quartzites, with retrograde woodhouseite, from the Sulu terrane, eastern China. American Mineralogist, 87, 445–453. [Topaz with 35-55% substitution of F by OH]
Komatsu, K., Kagi H., Okada, T., Kuribayashi, T., Parise, J.B., and Kudoh, Y. (2005) Pressure dependence of the OH-stretching mode in F-rich natural topaz and topaz-OH. American Mineralogist: 90: 266-270.
Topaz - Perfect Cleavage (2011) Extra Lapis English vol 14. 100p

Internet Links for TopazHide

Localities for TopazHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

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