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Talc

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About TalcHide

Formula:
Mg3Si4O10(OH)2
May contain variable amounts of minor Fe, Al and F.
As a Commodity:
Colour:
Colorless, white, pale green, bright emerald-green to dark green, brown, gray
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy, Pearly
Hardness:
1
Specific Gravity:
2.58 - 2.83
Crystal System:
Triclinic
Name:
Allegedly named in 1546 by Georgius Agricola (Georg Bauer) from Arabic "talq", pure, probably alluding to the color of its powder.
Almost always in foliated masses ranging from white to beautiful bluish green. Usually found in metamorphic rocks with abundant carbonate minerals associated.

Visit gemdat.org for gemological information about Talc.


Classification of TalcHide

Approved, 'Grandfathered' (first described prior to 1959)
9.EC.05

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
71.2.1.3

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
14.4.9

14 : Silicates not Containing Aluminum
4 : Silicates of Mg

Physical Properties of TalcHide

Sub-Vitreous, Resinous, Waxy, Greasy, Pearly
Transparency:
Transparent, Translucent
Colour:
Colorless, white, pale green, bright emerald-green to dark green, brown, gray
Streak:
White
Hardness:
Hardness Data:
Mohs hardness reference species
Tenacity:
Sectile
Cleavage:
Perfect
on {001}
Fracture:
Fibrous, Micaceous
Comment:
Flexible but not elastic. Feels slippery or greasy to the touch.
Density:
2.58 - 2.83 g/cm3 (Measured)    2.78 g/cm3 (Calculated)

Optical Data of TalcHide

Type:
Biaxial (-)
RI values:
nα = 1.538 - 1.550 nβ = 1.589 - 1.594 nγ = 1.589 - 1.600
Birefringence:
0.05
Max Birefringence:
δ = 0.051
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v perceptible
Pleochroism:
Weak
Comments:
Only visible in dark varieties.

Chemical Properties of TalcHide

Formula:
Mg3Si4O10(OH)2

May contain variable amounts of minor Fe, Al and F.
Common Impurities:
Ni,Fe,Al,Ca,Na,H2O

Crystallography of TalcHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.29 Å, b = 9.173 Å, c = 9.46 Å
α = 90.46°, β = 98.68°, γ = 90.09°
Ratio:
a:b:c = 0.577 : 1 : 1.031
Unit Cell V:
453.77 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Euhedral crystals are extremely rare, usually found in platy, foliated to fine-grained compact masses, sometimes has a radial appearance.
Comment:
The 1A polytype has C-1 setting. Pseudo-monoclinic.

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
9.31 Å(100)
4.67 Å(20)
4.55 Å(60)
3.12 Å(90)
2.59 Å(20)
2.48 Å(30)
2.23 Å(10)
1.524 Å(30)
Comments:
24-1493

Geological EnvironmentHide

Geological Setting:
Schists and steatite through hydrothermal alteration of mafic rocks. Low-temperature metamorphism of siliceous dolomites.

Synonyms of TalcHide

Other Language Names for TalcHide

Arabic:تلك
Basque:Talko
Bulgarian:Талк
Catalan:Talc
Croatian:Talk
Czech:Mastek
Danish:Fedtsten
Dutch:Talk
Esperanto:Talko
Finnish:Talkki
Galician:Talco
Hebrew:טלק
Hungarian:Zsírkő
Italian:Talco
Japanese:滑石
Latvian:Talks
Lithuanian:Talkas
Norwegian:Talk
Polish:Talk
Portuguese:Talco
Romanian:Talc
Russian:Тальк
Serbian:Талк
Simplified Chinese:滑石
Slovenian:Lojevec
Swedish:Talk
Turkish:Talk
Ukrainian:Тальк

Varieties of TalcHide

BeaconiteA fibrous variety of talc resembling asbestos.
Chromian TalcA Cr-bearing variety of talc.
Polyphant StoneA greyish-green potstone flecked with whiteand brown. Used since Norman times as an ornamental stone in churches.
PseudoliteOctahedral talc pseudomorphs after spinel.
SteatiteA massive variety of talc with a greasy feeling, often used for ornamental carvings.
Zincian TalcZn-bearing variety from the "Mixed Series" formation, Nežilovo, Macedonia. Associates, i.a., with ferricoronadite.

Relationship of Talc to other SpeciesHide

Other Members of this group:
FerripyrophylliteFe3+Si2O5(OH)Mon.
MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
PyrophylliteAl2Si4O10(OH)2Tric. 1
WillemseiteNi3Si4O10(OH)2Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
39 photos of Talc associated with QuartzSiO2
38 photos of Talc associated with Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
33 photos of Talc associated with CalciteCaCO3
21 photos of Talc associated with MagnesiteMgCO3
19 photos of Talc associated with PyriteFeS2
15 photos of Talc associated with KyaniteAl2(SiO4)O
15 photos of Talc associated with MagnetiteFe2+Fe3+2O4
13 photos of Talc associated with Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
13 photos of Talc associated with DolomiteCaMg(CO3)2
11 photos of Talc associated with HematiteFe2O3

Related Minerals - Nickel-Strunz GroupingHide

9.EC.05MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
9.EC.05WillemseiteNi3Si4O10(OH)2Mon.
9.EC.9.EC.VoloshiniteRb(LiAl1.51.5)(Al0.5Si3.5)O10F2Mon. 2/m : B2/b
9.EC.10FerripyrophylliteFe3+Si2O5(OH)Mon.
9.EC.10PyrophylliteAl2Si4O10(OH)2Tric. 1
9.EC.15BoromuscoviteKAl2(BSi3O10)(OH)2Mon.
9.EC.15CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2Mon.
9.EC.15Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
9.EC.15MuscoviteKAl2(AlSi3O10)(OH)2Mon. 2/m : B2/b
9.EC.15NanpingiteCsAl2(AlSi3O10)(OH,F)2Mon.
9.EC.15ParagoniteNaAl2(AlSi3O10)(OH)2Mon.
9.EC.15RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2Mon. 2/m : B2/b
9.EC.15Tobelite(NH4,K)Al2(AlSi3O10)(OH)2Mon.
9.EC.15AluminoceladoniteK(Mg,Fe2+)Al(Si4O10)(OH)2Mon.
9.EC.15ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2Mon. 2/m : B2/b
9.EC.15FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15ChromceladoniteK(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2Mon.
9.EC.15TainioliteKLiMg2(Si4O10)F2Mon.
9.EC.15Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2Mon.
9.EC.20AnniteKFe2+3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20EphesiteNaLiAl2(Al2Si2O10)(OH)2Tric.
9.EC.20HendricksiteKZn3(Si3Al)O10(OH)2Mon. 2/m : B2/m
9.EC.20Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2Mon.
9.EC.20NorrishiteKLiMn3+2(Si4O10)O2Mon. 2/m : B2/m
9.EC.20PhlogopiteKMg3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20PolylithioniteKLi2Al(Si4O10)(F,OH)2Mon. 2/m : B2/b
9.EC.20PreiswerkiteNaMg2Al(Al2Si2O10)(OH)2Mon.
9.EC.20SiderophylliteKFe2+2Al(Al2Si2O10)(OH)2Mon.
9.EC.20TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2
9.EC.20FluorotetraferriphlogopiteKMg3(Fe3+Si3O10)F2Mon. 2/m : B2/m
9.EC.20Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4Mon. 2/m : B2/m
9.EC.20EastoniteKMg2Al(Al2Si2O10)(OH)2Mon.
9.EC.20TetraferrianniteKFe2+3(Si3Fe3+)O10(OH)2Mon.
9.EC.20TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2Mon. 2/m : B2/b
9.EC.20FluoranniteKFe2+3(Si3Al)O10F2Mon.
9.EC.20ShirokshiniteKNaMg2(Si4O10)F2Mon. 2/m : B2/m
9.EC.20ShirozuliteKMn2+3(Si3Al)O10(OH)2Mon. 2/m : B2/m
9.EC.20SokolovaiteCsLi2Al(Si4O10)F2Mon.
9.EC.20AspidoliteNaMg3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20FluorophlogopiteKMg3(AlSi3O10)(F,OH)2Mon. 2/m : B2/m
9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20Suhailite(NH4)Fe2+3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20YangzhumingiteKMg2.5(Si4O10)F2Mon. 2/m : B2/m
9.EC.20OrloviteKLi2Ti(Si4O10)OFMon. 2 : B2
9.EC.20OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2Mon. 2/m : B2/m
9.EC.30MargariteCaAl2(Al2Si2O10)(OH)2Mon.
9.EC.35Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2Mon. 2/m : B2/b
9.EC.35BityiteLiCaAl2(AlBeSi2O10)(OH)2Mon. 2/m : B2/b
9.EC.35ClintoniteCa(Mg,Al)3(Al3SiO10)(OH)2Mon. 2/m : B2/m
9.EC.35Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2Mon.
9.EC.35Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2Mon.
9.EC.35Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2Mon. 2/m : B2/m
9.EC.35FluorokinoshitaliteBaMg3(Al2Si2O10)F2Mon. 2/m : B2/m
9.EC.40Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2OMon.
9.EC.40Kurumsakite(Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?)
9.EC.40Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2OMon. 2/m : B2/m
9.EC.40NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2OMon.
9.EC.40VolkonskoiteCa0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2OMon.
9.EC.40Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2OMon.
9.EC.45HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2Mon.
9.EC.45SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2OMon.
9.EC.45SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2OMon.
9.EC.45SpadaiteMgSiO2(OH)2 · H2O (?)
9.EC.45Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2Mon.
9.EC.45SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2OMon.
9.EC.45ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
9.EC.50VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2OMon. 2/m
9.EC.55Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8Tric. 1
9.EC.55Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8Mon.
9.EC.55ClinochloreMg5Al(AlSi3O10)(OH)8Mon. 2/m : B2/m
9.EC.55Cookeite(Al2Li)Al2(AlSi3O10)(OH)8Mon. 2/m
9.EC.55FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2
9.EC.55Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
9.EC.55Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8Mon.
9.EC.55Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55PennantiteMn2+5Al(AlSi3O10)(OH)8Tric.
9.EC.55SudoiteMg2Al3(Si3Al)O10)(OH)8Mon.
9.EC.55DonbassiteAl4.33(AlSi3O10)(OH)8Mon. 2 : B2
9.EC.55GlagoleviteNa(Mg,Al)6(AlSi3O10)(OH,O)8Tric. 1 : P1
9.EC.55BorocookeiteLi1+3xAl4-x(BSi3O10)(OH)8
9.EC.60AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2OMon.
9.EC.60Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2OOrth.
9.EC.60DozyiteMg7Al2(Al2Si4O15)(OH)12Mon.
9.EC.60HydrobiotiteK(Mg,Fe2+)6((Si,Al)8O20)(OH)4 · nH2OMon.
9.EC.60Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)
9.EC.60KulkeiteMg8Al(AlSi7O20)(OH)10Mon.
9.EC.60LunijianlaiteLi0.7Al6.2(AlSi7O20)(OH,O)10Mon.
9.EC.60Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2OMon.
9.EC.60Saliotite(Li,Na)Al3(AlSi3O10)(OH)5Mon.
9.EC.60TosuditeNa0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2OMon. 2 : B2
9.EC.60BrinrobertsiteNa0.3Al4(Si4O10)2(OH)4 · 3.5 H2OMon.
9.EC.65Macaulayite(Fe,Al)24Si4O43(OH)2Mon.
9.EC.70BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6Trig. 3m (3 2/m) : P3 1m
9.EC.75Ferrisurite(Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3 · nH2OMon.
9.EC.75Surite(Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2Mon.
9.EC.75Niksergievite(Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2OMon.
9.EC.80KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

71.2.1.1PyrophylliteAl2Si4O10(OH)2Tric. 1
71.2.1.2FerripyrophylliteFe3+Si2O5(OH)Mon.
71.2.1.4WillemseiteNi3Si4O10(OH)2Mon.
71.2.1.5MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.4.1ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
14.4.2EnstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
14.4.3ClinoenstatiteMgSiO3Mon. 2/m : P21/b
14.4.4ChrysotileMg3(Si2O5)(OH)4Mon.
14.4.5ClinochrysotileMon. 2/m
14.4.6OrthochrysotileOrth.
14.4.7ParachrysotileOrth.
14.4.8LizarditeMg3(Si2O5)(OH)4Trig. 3m : P3 1m
14.4.10SpadaiteMgSiO2(OH)2 · H2O (?)
14.4.11SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
14.4.12LoughliniteNa2Mg3Si6O16 · 8H2OOrth.
14.4.13EifeliteKNa3Mg4Si12O30Hex.
14.4.14Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2Mon.
14.4.15AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
14.4.16 Magnesio-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2

Fluorescence of TalcHide

Not usually fluorescent.

Other InformationHide

Thermal Behaviour:
Stable to about 900° Celsius.
Health Risks:
So-called talcum powders may have small amounts of amphibole contamination.
Industrial Uses:
Filler in paints, rubber. In cosmetics and as a lubricating dusting powder.

Talc in petrologyHide

References for TalcHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Agricola, G. (1546) Talk. in De Ortu & Causis Subterraneorum Lib. V, Froben (Basileae) 480-480.
Bras-de-Fer, L. (1778) (84) Terre (Élément). In Explication Morale du Jeu de Cartes; Anecdote Curieuse et Interessante, (Bruxelles): 99-100.
Avgustinik, A.I. and Vigderganz, V.S. (1948) Properties of talc during heating. Ogneupory: 13: 218-227.
Stemple, I.S. and Brindley, G.W. (1960) A structural study of talc and talc-tremolite relations. Journal of the American Ceramic Society: 43: 34-43.
Krönert, W., Schwiete, H.E., and Suchow, A. (1964) Das thermische Verhalten von Speckstein und die Stabilität der Magnesiummetasilikat-Modifikationen. Ziegelindustrie: 17: 364-369.
Krönert, W., Schwiete, H.E., and Suchow, A. (1964) Über das thermische Verhalten von Speckstein und die Stabilität der MgSiO3-Modifikationen. Naturwissenschaften: 51: 85-86.
Bošković, S.B., Gašić, M.Č., Nikolić, V.S., and Ristić, M.M. (1968) The structural changes of talc during heating. Proceedings of the British Ceramic Society: 10: 1-12.
Rayner, J.H. and Brown, G. (1973) The crystal structure of talc. Clays and Clay Minerals: 21: 103-114.
Perdikatsis B. and Burzlaff H. (1981) Zeitschrift für Kristallographie: 156: 177.
Wesolowski, M. (1984) Thermal decomposition of talc: a review. Thermochimica Acta: 78: 395-421.
Pawley, A.R., Redfern, S.A.T., and Wood, B.J. (1995) Thermal expansivities and compressibilities of hydrous phases in the system MgO-SiO2-H2O: talc, phase A, and 10-Å Phase. Contributions to Mineralogy and Petrology: 122: 301-307.
Ferrage, E., Martin, F., Petit, S., Pejo-Soucaille, S., Micoud, P., Fourty, G., Ferret, J., Salvi, S., de Parseval, P., and Fortune, J.P. (2003) Evaluation of talc morphology using FTIR and H/D substitution. Clay Minerals: 38: 141-150.
Petit, S., Martin, F., Wieqiora, A., de Parseval, P., and Decarreau, A. (2004) Crystal-chemistry of talc: A near infrared (NIR) spectroscopy study. American Mineralogist: 89: 319-326.
Zhang, M., Hui, Q., Lou, X.-J., Redfern, A.T., Salje, E.K.H., and Tarantino, S.C. (2006) Dehydroxylation, proton migration, and structural changes in heated talc: An infrared spectroscopic study: American Mineralogist: 91: 816-825.
Drits, V.A., Guggenheim, S., Zviagina, B.B., and Kogure, T. (2012) Structures of the 2:1 layers of pyrophyllite and talc. Clays and Clay Minerals: 60: 574-587.

Internet Links for TalcHide

Localities for TalcHide

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.

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