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Hectorite

A valid IMA mineral species - grandfathered - questionable
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About HectoriteHide

Formula:
Na0.3(Mg,Li)3(Si4O10)(F,OH)2
Colour:
White, cream, pale brown, mottled.
Lustre:
Waxy, Dull, Earthy
Hardness:
1 - 2
Specific Gravity:
2.3
Crystal System:
Monoclinic
Member of:

Unique IdentifiersHide

Mindat ID:
1841
Long-form identifier:
mindat:1:1:1841:4
GUID
(UUID V4):
ca469c5f-203d-4a61-bac5-23c16e6177b7

IMA Classification of HectoriteHide

Approved, 'Grandfathered' (first described prior to 1959), Questionable
IMA Formula:
Na0.3(Mg,Li)3Si4O10(F,OH)2 · nH2O

Classification of HectoriteHide

9.EC.45

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
71.3.1b.4

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays
17.1.1

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
HtrIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
HtrWarr (2020)Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of HectoriteHide

Waxy, Dull, Earthy
Transparency:
Translucent
Colour:
White, cream, pale brown, mottled.
Hardness:
1 - 2 on Mohs scale
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven
Density:
2.3 g/cm3 (Measured)    

Optical Data of HectoriteHide

Type:
Biaxial (-)
RI values:
nα = 1.490 nβ = 1.500 nγ = 1.520
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none
Comments:
2V(meas.) = Small

Chemistry of HectoriteHide

Mindat Formula:
Na0.3(Mg,Li)3(Si4O10)(F,OH)2
Common Impurities:
Ti,Al,Fe,Ca,K,Cl

Crystallography of HectoriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 5.25 Å, b = 9.18 Å, c = 16.0 Å
β = 99°
Ratio:
a:b:c = 0.572 : 1 : 1.743
Unit Cell V:
761.63 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0015819HectoriteBreu J, Seidl W, Stoll A (2003) Fehlordnung bei smectiten in abhangigkeit vom zwischenschichtkation Zeitschrift fur Anorganische und Allgemeine Chemie 629 503-5152003synthetic0293
CIF Raw Data - click here to close

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
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 EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of HectoriteHide

Geological Setting of Type Material:
bentonite deposit,
Associated Minerals at Type Locality:
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 HectoriteHide

Other Language Names for HectoriteHide

Relationship of Hectorite to other SpeciesHide

Member of:
Other Members of this group:
Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2OMon. 2/m : B2/m
FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2OMon.
Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2OMon. 2/m : B2/m
NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2OMon. 2/m : B2/m
PimeliteNi3Si4O10(OH)2 · 4H2OHex.
Saliotite(Li,Na)Al3(AlSi3O10)(OH)5Mon. 2/m : B2/m
SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2OMon.
SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2OMon.
Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2Mon.
SwineforditeLi(Al,Li,Mg)3((Si,Al)4O10)2(OH,F)4 · nH2OMon. 2/m : B2/m
VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2OMon. 2/m
VolkonskoiteCa0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2OMon.
Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2OMon.
ZincsiliteZn3Si4O10(OH)2 · 4H2O (?)Mon.

Related Minerals - Strunz-mindat GroupingHide

9.EC.BalestraiteKLi2V5+Si4O12Mon. 2 : B2
9.EC.MeifuiteKFe6(Si7Al)O19(OH)4Cl2Tric. 1 : P1
9.EC.05MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
9.EC.05TalcMg3Si4O10(OH)2Tric. 1 : P1
9.EC.05WillemseiteNi3Si4O10(OH)2Mon.
9.EC.9.EC.VoloshiniteRb(LiAl1.50.5)(Al0.5Si3.5)O10F2Mon. 2/m : B2/b
9.EC.10FerripyrophylliteFe3+Si2O5(OH)Mon. 2/m
9.EC.10PyrophylliteAl2Si4O10(OH)2Tric. 1
9.EC.10LuanshiweiiteKLiAl1.5(Si3.5Al0.5)O10(OH)2Mon. 2/m : B2/b
9.EC.10FluorluanshiweiiteKLiAl1.5(Si3.5Al0.5)O10F2Mon. 2/m : B2/m
9.EC.10ManganiceladoniteK(MgMn3+◻)(Si4O10)(OH)2Mon.
9.EC.10GarmiteCsLiMg2(Si4O10)F2Mon.
9.EC.10GorbunoviteCsLi2(Ti,Fe)Si4O10(F,OH,O)2Mon.
9.EC.15BoromuscoviteKAl2(BSi3O10)(OH)2Mon. 2/m
9.EC.15CeladoniteK(MgFe3+◻)(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)4Mon. 2/m : B2/m
9.EC.15MuscoviteKAl2(AlSi3O10)(OH)2Mon. 2/m : B2/b
9.EC.15NanpingiteCsAl2(AlSi3O10)(OH,F)2Mon. 2/m : B2/b
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. 2/m : B2/m
9.EC.15AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2Mon. 2/m : B2/b
9.EC.15FerroaluminoceladoniteK(Fe2+Al◻)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15FerroceladoniteK(Fe2+Fe3+◻)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15ChromceladoniteK(MgCr◻)(Si4O10)(OH)2Mon. 2 : B2
9.EC.15TainioliteKLiMg2(Si4O10)F2Mon. 2/m : B2/m
9.EC.15Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2Mon. 2/m : B2/b
9.EC.15UM1988-22-SiO:AlCaFFeHKLiMgKLiMgAl2Si3O10F2Mon.
9.EC.15KreiteriteCsLi2Fe3+(Si4O10)F2Mon.
9.EC.20AnniteKFe2+3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20EphesiteNaLiAl2(Al2Si2O10)(OH)2Tric. 1 : P1
9.EC.20HendricksiteKZn3(Si3Al)O10(OH)2Mon. 2/m : B2/m
9.EC.20Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2Mon. 2 : B2
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. 2/m : B2/b
9.EC.20SiderophylliteKFe2+2Al(Al2Si2O10)(OH)2Mon.
9.EC.20TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2Mon. 2/m : B2/m
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. 2/m : B2/m
9.EC.20TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2Mon. 2/m : B2/b
9.EC.20FluoranniteKFe2+3(Si3Al)O10F2Mon. 2/m : B2/m
9.EC.20ShirokshiniteK(NaMg2)(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(Si3Al)O10F2Mon. 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.20Chloroferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(Cl,OH,F)2
9.EC.22PimeliteNi3Si4O10(OH)2 · 4H2OHex.
9.EC.30Chlorophaeite(Ca,Mg,Fe)2Fe2Si4O13 · 10H2O
9.EC.30MargariteCaAl2(Al2Si2O10)(OH)2Mon. 2/m : B2/b
9.EC.35Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2Mon. 2/m : B2/b
9.EC.35BityiteCaLiAl2(AlBeSi2O10)(OH)2Mon. 2/m : B2/b
9.EC.35ClintoniteCaAlMg2(SiAl3O10)(OH)2Mon. 2/m : B2/m
9.EC.35Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2Mon. 2/m : B2/m
9.EC.35Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2Mon. 2/m : B2/m
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. 2/m : B2/m
9.EC.40Kurumsakite(Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?)Orth.
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. 2/m : B2/m
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.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)3((Si,Al)4O10)2(OH,F)4 · nH2OMon. 2/m : B2/m
9.EC.45ZincsiliteZn3Si4O10(OH)2 · 4H2O (?)Mon.
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2OMon.
9.EC.45HanjiangiteBa2CaV3+Al(H2AlSi3O12)(CO3)2FMon. 2 : B2
9.EC.50VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2OMon. 2/m
9.EC.52Tarasovitenear NaKAl11Si13O40(OH)9 · 3H2O
9.EC.55Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8Tric. 1
9.EC.55Chamosite(Fe2+)5Al(Si,Al)4O10(OH,O)8Mon. 2/m : B2/m
9.EC.55ClinochloreMg5Al(AlSi3O10)(OH)8Mon. 2/m : B2/m
9.EC.55Cookeite(LiAl4◻)[AlSi3O10](OH)8Mon. 2/m
9.EC.55FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2
9.EC.55Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8Orth.
9.EC.55Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8Mon. 2/m : B2/m
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. 2/m : B2/m
9.EC.55DonbassiteAl4.33(Si3Al)O10(OH)8Mon. 2 : B2
9.EC.55GlagoleviteNa(Mg,Al)6(AlSi3O10)(OH,O)8Tric. 1 : P1
9.EC.55Borocookeite(LiAl4◻)[BSi3O10](OH)8Mon. m : Bb
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. 2/m : B2/m
9.EC.60Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)Mon.
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. 2/m : B2/m
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. 2 : P21
9.EC.75Niksergievite(Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2OMon.
9.EC.80KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8Mon.

Other InformationHide

Notes:
Swells on addition of H2O
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Hectorite in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

Internet Links for HectoriteHide

References for HectoriteHide

Localities for HectoriteHide

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 ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Rio Grande do Norte
    • Parelhas
Robinson et al. (1998)
France
 
  • Brittany
    • Morbihan
      • Lorient
Chauris (2014)
Mexico
 
  • Chihuahua
    • Saucillo Municipality
      • Naica
Gazquez et al. (1)
Namibia
 
  • Erongo Region
    • Arandis Constituency
      • Cape Cross area
        • Strathmore pegmatites
Fuchsloch et al. (2018)
    • Karibib Constituency
      • Okongava Ost Farm 72
Ashworth (2014)
Bezing et al. (2007) +1 other reference
Romania
 
  • Caraş-Severin County
    • Moldova Nouă
Ianovici et al. (1983)
South America Plate
 
  • Santos basin
Schrank et al. (2024)
USA
 
  • Arizona
azminerals.com
      • Thompson Valley
        • Hillside
Eyde (1986) +1 other reference
  • California
    • Inyo County
      • Amargosa Desert
- (2005)
    • Kern County
      • Boron
Van Nostrand Reinholt Press: 439. +2 other references
    • San Bernardino County
      • Cady Mountains
        • Hector
Van Nostrand Reinholt Press: 440. +3 other references
Van Nostrand Reinholt Press: 440. +2 other references
Van Nostrand Reinholt Press: 440. +2 other references
- (2005)
Van Nostrand Reinholt Press: 377. +3 other references
  • Nevada
    • Clark County
      • Las Vegas Mining District
Castor et al. (2004)
      • Muddy Mountains
        • Muddy Mountains Mining District
          • White Basin
- (2005)
    • Esmeralda County
- (2005)
- (2005)
Castor et al. (2004) +1 other reference
    • Humboldt County
Castor et al. (2004)
      • Montana Mountains
        • Disaster Mining District
- (2005)
Castor et al. (2004)
- (2005)
- (2005)
Castor et al. (2004)
    • Lincoln County
      • Bristol and Jackrabbit Mining Districts
- (2005)
  • Utah
    • Duchesne County
Bullock (1981)
    • Juab County
      • Thomas Range
Bullock (1981)
 
Mineral and/or Locality  
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