Unique Identifiers

IMA Formula:

Na_0.3(Mg,Li)₃Si₄O₁₀(F,OH)₂ · nH₂O🗐

Type description reference:

Strese, V.H., Hofmann, U. (1941) Synthese von Magnesiumsilikat-Gelen mit zweidimensional regelmäßiger Struktur. Zeitschrift für Anorganische und Allgemeine Chemie: 247: 65-94.

Classification of Hectorite

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

Dana 8th ed.:

71.3.1b.4

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays

Hey's CIM Ref.:

17.1.1

17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)

Mineral Symbols

Transparency:

Translucent

Colour:

White, cream, pale brown, mottled

Hardness:

1 - 2 onMohs scale

Cleavage:

Perfect
{001}

Fracture:

Irregular/Uneven

Density:

2.3 g/cm³ (Measured)    

Optical Data of Hectorite

Surface Relief:

Moderate

Dispersion:

none

Comments:

2V(meas.) = Small

Chemistry of Hectorite

Common Impurities:

Ti,Al,Fe,Ca,K,Cl

Crystallography of HectoriteHector, California, USA 2417

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

d-spacing	Intensity
4.58 Å	(100)
1.53 Å	(100)
15.8 Å	(80)
2.66 Å	(80)
1.32 Å	(80)
1.30 Å	(80)
2.48 Å	(60)

Comments:

spacings variable by humidity, intensities variable by orientation

Geological Environment

Geological Setting of Type Material:

bentonite deposit,

Associated Minerals at Type Locality:

Calcite

Clinoptilolite Subgroup

Reference:

Strese, V.H., Hofmann, U. (1941) Synthese von Magnesiumsilikat-Gelen mit zweidimensional regelmäßiger Struktur. Zeitschrift für Anorganische und Allgemeine Chemie: 247: 65-94.

Synonyms of Hectorite

Other Language Names for Hectorite

Relationship of Hectorite to other Species

Other Members of Smectite Group:

Beidellite	(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O	Mon. 2/m :B2/m
Ferrosaponite	Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O	Mon.
Montmorillonite	(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O	Mon. 2/m :B2/m
Nontronite	Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O	Mon. 2/m :B2/m
Pimelite	Ni3Si4O10(OH)2 · 4H2O	Hex.
Saliotite	(Li,Na)Al3(AlSi3O10)(OH)5	Mon. 2/m :B2/m
Saponite	Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O	Mon.
Sauconite	Na0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O	Mon.
Stevensite	(Ca,Na)xMg3-x(Si4O10)(OH)2	Mon.
Swinefordite	Li(Al,Li,Mg)3((Si,Al)4O10)2(OH,F)4 · nH2O	Mon. 2/m :B2/m
Volkonskoite	Ca0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O	Mon.
Yakhontovite	(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O	Mon.
Zincsilite	Zn3Si4O10(OH)2 · 4H2O (?)	Mon.

Related Minerals -Strunz-mindat GroupingTric.1 :P19.EC.BalestraiteKLi₂V⁵⁺Si₄O₁₂Mon. 2 :B29.EC.05TalcMg₃Si₄O₁₀(OH)₂Tric.1 :P19.EC.05MinnesotaiteFe²⁺₃Si₄O₁₀(OH)₂Tric.1 :P19.EC.05WillemseiteNi₃Si₄O₁₀(OH)₂Mon.9.EC.9.EC.VoloshiniteRb(LiAl_1.5◻_0.5)(Al_0.5Si_3.5)O₁₀F₂Mon. 2/m :B2/b9.EC.10FluorluanshiweiiteKLiAl_1.5(Si_3.5Al_0.5)O₁₀F₂Mon. 2/m :B2/m9.EC.10GarmiteCsLiMg₂(Si₄O₁₀)F₂Mon.9.EC.10GorbunoviteCsLi₂(Ti,Fe)Si₄O₁₀(F,OH,O)₂Mon.9.EC.10FerripyrophylliteFe³⁺Si₂O₅(OH)Mon. 2/m9.EC.10ManganiceladoniteK(MgMn³⁺◻)(Si₄O₁₀)(OH)₂Mon.9.EC.10LuanshiweiiteKLiAl_1.5(Si_3.5Al_0.5)O₁₀(OH)₂Mon. 2/m :B2/b9.EC.10PyrophylliteAl₂Si₄O₁₀(OH)₂Tric.19.EC.15ParagoniteNaAl₂(AlSi₃O₁₀)(OH)₂Mon.9.EC.15FerroaluminoceladoniteK(Fe²⁺Al◻)(Si₄O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.15NanpingiteCsAl₂(AlSi₃O₁₀)(OH,F)₂Mon. 2/m :B2/b9.EC.15FerroceladoniteK(Fe²⁺Fe³⁺◻)(Si₄O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.15Ganterite(Ba,Na,K)(Al,Mg)₂(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/b9.EC.15KreiteriteCsLi₂Fe³⁺(Si₄O₁₀)F₂Mon.9.EC.15RoscoeliteKV³⁺₂(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/b9.EC.15AluminoceladoniteK(MgAl◻)(Si₄O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.15Tobelite(NH₄)Al₂(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.15TainioliteKLiMg₂(Si₄O₁₀)F₂Mon. 2/m :B2/m9.EC.15CeladoniteK(MgFe³⁺◻)(Si₄O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.15ChromceladoniteK(MgCr◻)(Si₄O₁₀)(OH)₂Mon. 2 :B29.EC.15MontdoriteKFe²⁺_1.5Mn²⁺_0.5Mg_0.5Si₄O₁₀(F,OH)₂Mon. 2/m :B2/m9.EC.15ChromphylliteKCr₂(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/b9.EC.15BoromuscoviteKAl₂(BSi₃O₁₀)(OH)₂Mon. 2/m9.EC.15UM1988-22-SiO:AlCaFFeHKLiMgKLiMgAl₂Si₃O₁₀F₂Mon.9.EC.15Chernykhite(Ba,Na)(V³⁺,Al,Mg)₂((Si,Al)₄O₁₀)(OH)₂Mon.9.EC.15MuscoviteKAl₂(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/b9.EC.20MasutomiliteK(LiAlMn²⁺)[AlSi₃O₁₀]F₂Mon. 2 :B29.EC.20OxyphlogopiteK(Mg,Ti,Fe)₃[(Si,Al)₄O₁₀](O,F)₂Mon. 2/m :B2/m9.EC.20Chloroferrokinoshitalite(Ba,K)(Fe²⁺,Mg)₃(Al₂Si₂O₁₀)(Cl,OH,F)₂9.EC.20SiderophylliteKFe²⁺₂Al(Al₂Si₂O₁₀)(OH)₂Mon.9.EC.20SokolovaiteCsLi₂Al(Si₄O₁₀)F₂Mon.9.EC.20HendricksiteKZn₃(Si₃Al)O₁₀(OH)₂Mon. 2/m :B2/m9.EC.20TetraferriphlogopiteKMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂Mon. 2/m :B2/m9.EC.20FluoranniteKFe²⁺₃(Si₃Al)O₁₀F₂Mon. 2/m :B2/m9.EC.20AspidoliteNaMg₃(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.20Suhailite(NH₄)Fe²⁺₃(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.20EphesiteNaLiAl₂(Al₂Si₂O₁₀)(OH)₂Tric. 1 :P19.EC.20NorrishiteKLiMn³⁺₂(Si₄O₁₀)O₂Mon. 2/m :B2/m9.EC.20PhlogopiteKMg₃(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.20YangzhumingiteKMg_2.5(Si₄O₁₀)F₂Mon. 2/m :B2/m9.EC.20OrloviteKLi₂Ti(Si₄O₁₀)OFMon. 2 :B29.EC.20TetraferrianniteKFe²⁺₃(Si₃Fe³⁺)O₁₀(OH)₂Mon. 2/m :B2/m9.EC.20ShirokshiniteK(NaMg₂)(Si₄O₁₀)F₂Mon. 2/m :B2/m9.EC.20TrilithioniteK(Li_1.5Al_1.5)(AlSi₃O₁₀)(F,OH)₂Mon. 2/m :B2/b9.EC.20PolylithioniteKLi₂Al(Si₄O₁₀)(F,OH)₂Mon. 2/m :B2/b9.EC.20ShirozuliteKMn²⁺₃(Si₃Al)O₁₀(OH)₂Mon. 2/m :B2/m9.EC.20PreiswerkiteNaMg₂Al(Al₂Si₂O₁₀)(OH)₂Mon. 2/m :B2/b9.EC.20FluorophlogopiteKMg₃(Si₃Al)O₁₀F₂Mon. 2/m :B2/m9.EC.20Wonesite(Na,K)(Mg,Fe,Al)₆((Al,Si)₄O₁₀)₂(OH,F)₄Mon. 2/m :B2/m9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)_2.6((Si,Al)₄O₁₀)(F,OH)₂9.EC.20FluorotetraferriphlogopiteKMg₃(Fe³⁺Si₃O₁₀)F₂Mon. 2/m :B2/m9.EC.20AnniteKFe²⁺₃(AlSi₃O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.20EastoniteKMg₂Al(Al₂Si₂O₁₀)(OH)₂Mon.9.EC.22PimeliteNi₃Si₄O₁₀(OH)₂ · 4H₂OHex.9.EC.30MargariteCaAl₂(Al₂Si₂O₁₀)(OH)₂Mon. 2/m :B2/b9.EC.30Chlorophaeite(Ca,Mg,Fe)₂Fe₂Si₄O₁₃ · 10H₂O9.EC.35Kinoshitalite(Ba,K)(Mg,Mn²⁺,Al)₃(Al₂Si₂O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.35Ferrokinoshitalite(Ba,K)(Fe²⁺,Mg)₃(Al₂Si₂O₁₀)(OH,F)₂Mon. 2/m :B2/m9.EC.35ClintoniteCaAlMg₂(SiAl₃O₁₀)(OH)₂Mon. 2/m :B2/m9.EC.35Oxykinoshitalite(Ba,K)(Mg,Ti,Fe³⁺,Fe²⁺)₃((Si,Al)₄O₁₀)(O,OH,F)₂Mon. 2/m :B2/m9.EC.35FluorokinoshitaliteBaMg₃(Al₂Si₂O₁₀)F₂Mon. 2/m :B2/m9.EC.35BityiteCaLiAl₂(AlBeSi₂O₁₀)(OH)₂Mon. 2/m :B2/b9.EC.35Anandite(Ba,K)(Fe²⁺,Mg)₃((Si,Al,Fe)₄O₁₀)(S,OH)₂Mon. 2/m :B2/b9.EC.40Montmorillonite(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂OMon. 2/m :B2/m9.EC.40Beidellite(Na,Ca_0.5)_0.3Al₂((Si,Al)₄O₁₀)(OH)₂ · nH₂OMon. 2/m :B2/m9.EC.40VolkonskoiteCa_0.3(Cr,Mg,Fe)₂((Si,Al)₄O₁₀)(OH)₂ · 4H₂OMon.9.EC.40NontroniteNa_0.3Fe₂((Si,Al)₄O₁₀)(OH)₂ · nH₂OMon. 2/m :B2/m9.EC.40Kurumsakite(Zn,Ni,Cu)₈Al₈V⁵⁺₂Si₅O₃₅ · 27H₂O (?)Orth.9.EC.40Yakhontovite(Ca,Na)_0.5(Cu,Fe,Mg)₂(Si₄O₁₀)(OH)₂ · 3H₂OMon.9.EC.45SwineforditeLi(Al,Li,Mg)₃((Si,Al)₄O₁₀)₂(OH,F)₄ · nH₂OMon. 2/m :B2/m9.EC.45ZincsiliteZn₃Si₄O₁₀(OH)₂ · 4H₂O (?)Mon.9.EC.45HanjiangiteBa₂CaV³⁺Al(H₂AlSi₃O₁₂)(CO₃)₂FMon. 2 :B29.EC.45SpadaiteMgSiO₂(OH)₂ · H₂O (?)9.EC.45FerrosaponiteCa_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂OMon.9.EC.45Stevensite(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂Mon.9.EC.45SaponiteCa_0.25(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ · nH₂OMon.9.EC.45SauconiteNa_0.3Zn₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂OMon.9.EC.50VermiculiteMg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂OMon. 2/m9.EC.52Tarasovitenear NaKAl₁₁Si₁₃O₄₀(OH)₉ · 3H₂O9.EC.55ClinochloreMg₅Al(AlSi₃O₁₀)(OH)₈Mon. 2/m :B2/m9.EC.55Borocookeite(LiAl₄◻)[BSi₃O₁₀](OH)₈Mon.m :Bb9.EC.55FranklinfurnaceiteCa₂Fe³⁺Mn²⁺₃Mn³⁺(Zn₂Si₂O₁₀)(OH)₈Mon. 2 :B29.EC.55PennantiteMn²⁺₅Al(AlSi₃O₁₀)(OH)₈Tric.9.EC.55VakhrushevaiteMg₅Cr(AlSi₃O₁₀)(OH)₈Tric.19.EC.55Nimite(Ni,Mg,Al)₆((Si,Al)₄O₁₀)(OH)₈Mon. 2/m :B2/m9.EC.55Cookeite(LiAl₄◻)[AlSi₃O₁₀](OH)₈Mon. 2/m9.EC.55Gonyerite(Mn²⁺,Mg)₅Fe³⁺(Fe³⁺Si₃O₁₀)(OH)₈Orth.9.EC.55Chamosite(Fe²⁺,Mg,Al,Fe³⁺)₆(Si,Al)₄O₁₀(OH,O)₈Mon. 2/m :B2/m9.EC.55Orthochamosite(Fe²⁺,Mg,Fe³⁺)₅Al(AlSi₃O₁₀)(OH,O)₈9.EC.55Baileychlore(Zn,Fe²⁺,Al,Mg)₆(Si,Al)₄O₁₀(OH)₈Tric.19.EC.55SudoiteMg₂Al₃(Si₃Al)O₁₀)(OH)₈Mon. 2/m :B2/m9.EC.55GlagoleviteNa(Mg,Al)₆(AlSi₃O₁₀)(OH,O)₈Tric. 1 :P19.EC.55DonbassiteAl_4.33(Si₃Al)O₁₀(OH)₈Mon. 2 :B29.EC.60DozyiteMg₇Al₂(Al₂Si₄O₁₅)(OH)₁₂Mon.9.EC.60Rectorite(Na,Ca)Al₄((Si,Al)₈O₂₀)(OH)₄ · 2H₂OMon.9.EC.60Corrensite(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂OOrth.9.EC.60AliettiteCa_0.2Mg₆((Si,Al)₈O₂₀)(OH)₄ · 4H₂OMon.9.EC.60Karpinskite(Ni,Mg)₂Si₂O₅(OH)₂ (?)Mon.9.EC.60LunijianlaiteLi_0.7Al_6.2(AlSi₇O₂₀)(OH,O)₁₀Mon.9.EC.60TosuditeNa_0.5(Al,Mg)₆((Si,Al)₈O₁₈)(OH)₁₂ · 5H₂OMon. 2 :B29.EC.60HydrobiotiteK(Mg,Fe²⁺)₆((Si,Al)₈O₂₀)(OH)₄ · nH₂OMon. 2/m :B2/m9.EC.60Saliotite(Li,Na)Al₃(AlSi₃O₁₀)(OH)₅Mon. 2/m :B2/m9.EC.60KulkeiteMg₈Al(AlSi₇O₂₀)(OH)₁₀Mon.9.EC.60BrinrobertsiteNa_0.3Al₄(Si₄O₁₀)₂(OH)₄ · 3.5 H₂OMon.9.EC.65Macaulayite(Fe,Al)₂₄Si₄O₄₃(OH)₂Mon.9.EC.70BurckhardtitePb₂(Fe³⁺Te⁶⁺)[AlSi₃O₈]O₆Trig.3m(32/m) :P31m9.EC.75Niksergievite(Ba,Ca)₂Al₃(AlSi₃O₁₀)(CO₃)(OH)₆ · nH₂OMon.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. 2 :P2₁9.EC.80KegelitePb₈Al₄(Si₈O₂₀)(SO₄)₂(CO₃)₄(OH)₈Mon.

Other Information

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for HectoriteⓘCapoeira 1 pegmatite (Boqueirãozinho pegmatite)Robinson et al. (1998)

China

 

• Xinjiang

• Ili Kazakh Autonomous Prefecture

• Altay Prefecture (Aletai Prefecture)

• Fuyun Co. (Koktokay Co.)

• ⓘBieyesamasi rare metal deposit

何晗晗; 艾尔肯; 吐尔孙; 王登红; 王瑞江; 陈振宇 (2020)

France

 

• Brittany

• Morbihan

• Lorient

• ⓘGroix

Chauris (2014)

Mexico

 

• Chihuahua

• Saucillo Municipality

• Naica

• ⓘNaica Mine

Gazquez et al. (1)

Namibia

 

• Erongo Region

• Arandis Constituency

• Cape Cross area

• Strathmore pegmatites

• ⓘMolopo Mine (Petalite Pegmatite)

Fuchsloch et al. (2018)

• Karibib Constituency

• Okongava Ost Farm 72

• ⓘHelikon II pegmatite

Ashworth (2014)

• ⓘRubikon Mine

Bezing et al. (2007)+1 other reference

Romania

 

• Caraş-Severin County

• Moldova Nouă

• ⓘMoldova Nouă Mine

Ianovici et al. (1983)

South America Plate

 

• Santos basin

• ⓘOil fields

Schrank et al. (2024)

USA

 

• Arizona

• ⓘYavapai County

azminerals.com

• Thompson Valley

• Hillside

• ⓘLyles Hectorite Mine (Lyles Hectorite deposit; Lyles deposit; White Hills Lithium prospect)

Eyde (1986)+1 other reference

• California

• Inyo County

• Amargosa Desert

• ⓘHectorite Mine (Industrial Mineral Ventures Mine; Franklin Well)

- (2005)

• Kern County

• Boron

• ⓘKramer Borate deposit

Morgan et al. (1969)+2 other references

• San Bernardino County

• ⓘHector

- (2005)

• ⓘHector Bentonite Mine No. 1 (TL)

Foshag et al. (1936)+3 other references

• ⓘHector Bentonite Mine No. 2

Wright et al. (1953)+2 other references

• ⓘNewberry Hectorite Mine

Wright et al. (1953)+2 other references

• ⓘNorth group of claims

Ames et al. (1958)+3 other references

• Nevada

• Clark County

• Las Vegas Mining District

• ⓘFrenchman Mountain

Castor et al. (2004)

• Muddy Mountains

• Muddy Mountains Mining District

• White Basin

• ⓘMuddy Mountains Borates (American Borax Co. Mines)

- (2005)

• Esmeralda County

• ⓘSilver Peak Marsh

- (2005)

• ⓘFoote Lithium Brine Operation

- (2005)

• ⓘSilver Peak Production Site (Silver Peak Marsh; Clayton Valley)

Castor et al. (2004)+1 other reference

• Humboldt County

• ⓘMcDermitt Caldera Center

Castor et al. (2004)

• Montana Mountains

• Disaster Mining District

• ⓘDisaster Peak

- (2005)

• ⓘDisaster Peak property (Nevada Cinnabar Group; Bretchell Mercury Deposit)

Castor et al. (2004)

• ⓘEd Deposit

- (2005)

• ⓘKings Valley

- (2005)

• ⓘMontana Mountains deposit

Castor et al. (2004)

• Lincoln County

• Bristol and Jackrabbit Mining Districts

• ⓘLucky Star mine (Giant mine)

- (2005)

• Oregon

• Malheur County

• ⓘJindalee McDermitt Li deposit

Asadzadeh et al. (2025)

• Utah

• Duchesne County

• ⓘGreen River Formation outcrops

Bullock (1981)

• Juab County

• Thomas Range

• ⓘSpor Mountain Mining District

Bullock (1981)

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