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Hectorite

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Formula:
Na0.3(Mg,Li)3Si4O10(F,OH)2 · nH2O
System:
Monoclinic
Hardness:
1 - 2
Member of:

Classification of Hectorite

Approved, 'Grandfathered' (first described prior to 1959), Questionable
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)

Physical Properties of Hectorite

Hardness (Mohs):
1 - 2

Optical Data of Hectorite

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

Chemical Properties of Hectorite

IMA Formula:
Na0.3(Mg,Li)3Si4O10(F,OH)2 · nH2O
Elements listed in formula:
Common Impurities:
Ti,Al,Fe,Ca,K,Cl

Crystallography of Hectorite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.25 Å, b = 9.18 Å, c = 16 Å
β = 99°
Ratio:
a:b:c = 0.572 : 1 : 1.743
Unit Cell Volume:
V 761.63 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of Hectorite

Relationship of Hectorite to other Species

Member of:
Other Members of Group:
AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O
Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
PimeliteNi3Si4O10(OH)2·4H2O
Saliotite(Li,Na)Al3(AlSi3O10)(OH)5
SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2O
VolkonskoiteCa0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O
Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O
ZincsiliteZn3(Si4O10)(OH)2 · 4H2O
9.EC.05MinnesotaiteFe32+Si4O10(OH)2
9.EC.05TalcMg3Si4O10(OH)2
9.EC.05WillemseiteNi3Si4O10(OH)2
9.EC.10FerripyrophylliteFe3+Si2O5(OH)
9.EC.10PyrophylliteAl2Si4O10(OH)2
9.EC.15BoromuscoviteKAl2(Si3B)O10(OH)2
9.EC.15CeladoniteKMgFe3+Si4O10(OH)2
9.EC.15ChernykhiteBaV23+(Si2Al2)O10(OH)2
9.EC.15MontdoriteKFe2+1.5Mn2+0.5Mg0.5Si4O10(F,OH)2
9.EC.15MuscoviteKAl2(Si3Al)O10(OH)2
9.EC.15NanpingiteCsAl2(Si3Al)O10(OH)2
9.EC.15ParagoniteNaAl2(Si3Al)O10(OH)2
9.EC.15RoscoeliteKV23+(Si3Al)O10(OH)2
9.EC.15Tobelite(NH4)Al2(Si3Al)O10(OH)2
9.EC.15AluminoceladoniteKMgAlSi4O10(OH)2
9.EC.15ChromphylliteKCr2(Si3Al)O10(OH)2
9.EC.15FerroaluminoceladoniteKFe2+AlSi4O10(OH)2
9.EC.15FerroceladoniteKFe2+Fe3+Si4O10(OH)2
9.EC.15ChromceladoniteKMgCrSi4O10(OH)2
9.EC.15TainioliteKLiMg2Si4O10F2
9.EC.15GanteriteBa0.5(Na,K)0.5Al2(Si2.5Al1.5)O10(OH)2
9.EC.20AnniteKFe32+AlSi3O10(OH)2
9.EC.20EphesiteNaLiAl2(Si2Al2)O10(OH)2
9.EC.20HendricksiteKZn3(Si3Al)O10(OH)2
9.EC.20MasutomiliteKLiAlMn2+(Si3Al)O10(F,OH)2
9.EC.20NorrishiteKLiMn23+Si4O12
9.EC.20PhlogopiteKMg3(Si3Al)O10(OH)2
9.EC.20PolylithioniteKLi2AlSi4O10F2
9.EC.20PreiswerkiteNaAlMg2(Si2Al2)O10(OH)2
9.EC.20SiderophylliteKFe22+Al(Si2Al2)O10(OH)2
9.EC.20TetraferriphlogopiteKMg3(Si3Fe3+)O10(OH)2
9.EC.20FluorotetraferriphlogopiteKMg3Fe3+Si3O10F2
9.EC.20Wonesite(Na,K,◻)(Mg,Fe,Al)6(Si,Al)8O20(OH,F)4
9.EC.20EastoniteKAlMg2(Si2Al2)O10(OH)2
9.EC.20TetraferrianniteKFe32+(Si3Fe3+)O10(OH)2
9.EC.20TrilithioniteKLi1.5Al1.5(Si3Al)O10F2
9.EC.20FluoranniteKFe32+(Si3Al)O10F2
9.EC.20ShirokshiniteK(Mg2Na)Si4O10F2
9.EC.20ShirozuliteKMn32+(Si3Al)O10(OH)2
9.EC.20SokolovaiteCsLi2AlSi4O10F2
9.EC.20AspidoliteNaMg3(Si3Al)O10(OH)2
9.EC.20FluorophlogopiteKMg3(Si3Al)O10F2
9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20Suhailite(NH4)Fe32+(Si3Al)O10(OH)2
9.EC.20YangzhumingiteKMg2.5Si4O10F2
9.EC.20OrloviteKLi2TiSi4O10(OF)
9.EC.20OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
9.EC.25Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
9.EC.30MargariteCaAl2(Si2Al2)O10(OH)2
9.EC.35AnanditeBaFe32+(Si3Fe3+)O10S(OH)
9.EC.35BityiteCaLiAl2(Si2BeAl)O10(OH)2
9.EC.35ClintoniteCaAlMg2(SiAl3)O10(OH)2
9.EC.35KinoshitaliteBaMg3(Si2Al2)O10(OH)2
9.EC.35FerrokinoshitaliteBaFe32+(Si2Al2)O10(OH)2
9.EC.35OxykinoshitaliteBaMg2Ti4+O2(Si2Al2)O10
9.EC.35FluorokinoshitaliteBaMg3Al2Si2O10F2
9.EC.40Beidellite(Na,Ca)0.3Al2(Si,Al)4O10(OH)2 · nH2O
9.EC.40KurumsakiteZn8Al8V25+Si5O35 · 27H2O
9.EC.40Montmorillonite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2 · nH2O
9.EC.40NontroniteNa0.3Fe23+(Si,Al)4O10(OH)2 · nH2O
9.EC.40VolkonskoiteCa0.3(Cr,Mg)2(Si,Al)4O10(OH)2 · 4H2O
9.EC.40Yakhontovite(Ca,Na,K)0.2(Cu,Fe,Mg)2Si4O10(OH)2 · 3H2O
9.EC.45Saponite(Ca,Na)0.3(Mg,Fe2+)3(Si,Al)4O10(OH)2 · 4H2O
9.EC.45SauconiteNa0.3Zn3(Si,Al)4O10(OH)2 · 4H2O
9.EC.45SpadaiteMgSiO2(OH)2 · H2O(?)
9.EC.45Stevensite(Ca,Na)xMg3-ySi4O10(OH)2
9.EC.45SwineforditeCa0.2(Li,Al,Mg,Fe)3(Si,Al)4O10(OH,F)2 · nH2O
9.EC.45ZincsiliteZn3Si4O10(OH)2 · 4H2O
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3(Si,Al)4O10(OH)2 · 4H2O
9.EC.50VermiculiteMg0.7(Mg,Fe3+,Al)6(Si,Al)8O20(OH)4 · 8H2O
9.EC.55Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8
9.EC.55Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
9.EC.55ClinochloreMg5Al(AlSi3O10)(OH)8
9.EC.55Cookeite(Al,Li)3Al2(Si,Al)4O10(OH)8
9.EC.55FranklinfurnaceiteCa2Mn32+Mn3+Fe3+Zn2Si2O10(OH)8
9.EC.55GonyeriteMn52+Fe3+(Si3Fe3+O10)(OH)8
9.EC.55Nimite(Ni,Mg,Al)6(Si,Al)4O10(OH)8
9.EC.55Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55Pennantite(Mn2+,Al)6(Si,Al)4O10(OH)8
9.EC.55SudoiteMg2Al3(Si3Al)O10(OH)8
9.EC.55DonbassiteAl2(Si3Al)O10(OH)2 · Al2.33(OH)6
9.EC.55GlagoleviteNa(Mg,Al)6(Si3Al)O10(OH,O)8
9.EC.55BorocookeiteLiAl4(Si3B)O10(OH)8
9.EC.60AliettiteCa0.2Mg6(Si,Al)8O20(OH)4 · 4H2O
9.EC.60Corrensite(Ca,Na,K)1-x(Mg,Fe,Al)9(Si,Al)8O20(OH)10 · nH2O
9.EC.60DozyiteMg7Al2(Si4Al2)O15(OH)12
9.EC.60HydrobiotiteK(Mg,Fe2+)6(Si,Al)8O20(OH)4 · nH2O
9.EC.60Karpinskite(Mg,Ni)2Si2O5(OH)2(?)
9.EC.60KulkeiteNa0.3Mg8Al(Si,Al)8O20(OH)10
9.EC.60LunijianlaiteLi0.7Al6.2(Si7Al)20(OH,O)10
9.EC.60Rectorite(Na,Ca)Al4(Si,Al)8O20(OH)4 · 2H2O
9.EC.60Saliotite(Li,Na)Al3(Si3Al)O10(OH)5
9.EC.60TosuditeNa0.5(Al,Mg)6(Si,Al)8O18(OH)12 · 5H2O
9.EC.60Brinrobertsite(Na,K,Ca)0.3(Al,Fe,Mg)4(Si,Al)8O20(OH)4 · 3.5H2O
9.EC.65MacaulayiteFe243+Si4O43(OH)2
9.EC.70BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6
9.EC.75FerrisuritePb2.4Fe23+Si4O10(CO3)1.7(OH)3 · nH2O
9.EC.75Surite(Pb,Ca)3Al2(Si,Al)4O10(CO3)2(OH)3 · 0.3H2O
9.EC.75NiksergieviteBa2Al3(Si,Al)4O10(CO3)(OH)6 · nH2O
9.EC.80KegelitePb4Al2Si4O10(SO4)(CO3)2(OH)4
17.1.3AgrelliteNaCa2Si4O10F
17.1.4Fluorapophyllite-(Na)NaCa4Si8O20F · 8H2O
17.1.5Fluorapophyllite-(K)KCa4Si8O20F · 8H2O
17.1.6Hydroxyapophyllite-(K)KCa4Si8O20(OH,F) · 8H2O
17.1.7HsianghualiteLi2Ca3Be3(SiO4)3F2
17.1.8LeucophaniteNaCaBeSi2O6F
17.1.9NorbergiteMg3SiO4F2
17.1.10ChondroditeMg5(SiO4)2F2
17.1.11HumiteMg7(SiO4)3(F,OH)2
17.1.12ClinohumiteMg9(SiO4)4F2
17.1.13CanasiteK3Na3Ca5Si12O30(OH)4
17.1.14Charoite(K,Sr,Ba,Mn)15-16(Ca,Na)32Si70(O,OH)180(OH,F)4 · nH2O
17.1.15CuspidineCa4(Si2O7)F2
17.1.16BultfonteiniteCa2[SiO3(OH)]F · H2O
17.1.17ZeophylliteCa13Si10O28(OH)2F8 · 6H2O
17.1.18Rowlandite-(Y)Fe2+Y4(Si2O7)2F2
17.1.19YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3
17.1.20Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
17.1.21Mosandrite-(Ce)(Ca3Ce)[(H2O)2Ca0.50.5]Ti(Si2O7)2(OH)2(H2O)2
17.1.22Hiortdahlite(Na,Ca)2Ca4Zr(Mn,Ti,Fe)(Si2O7)2(F,O)4
17.1.23BurpaliteNa2CaZr(Si2O7)F2
17.1.24SeidozeriteNa2Zr2Na2MnTi(Si2O7)2O2F2
17.1.25Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O
17.1.26ZircophylliteK2NaMn72+Zr2(Si4O12)2O2(OH)4F
17.1.27JinshajiangiteBaNaFe42+Ti2(Si2O7)2O2(OH)2F
17.1.28RosenbuschiteCa6Zr2Na6ZrTi(Si2O7)4(OF)2F4
17.1.29NarsarsukiteNa2(Ti,Fe3+)Si4(O,F)11
17.1.30SonoliteMn92+(SiO4)4(OH)2

Other Names for Hectorite

Name in Other Languages:

Other Information

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

References for Hectorite

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

Fleischer, M. (1944) New mineral names. American Mineralogist: 29: 73-74.

Oberlin, A., Mering, J. (1966) Observations sur l’hectorite (etude en microscopie et diffraction electroniques). Societe Francais de Mineralogie et Crystallographie Bulletin: 89: 29-40.

Chaussidon, J. (1970) Stretching frequencies of structural hydroxyls of hectorite and K-depleted phlogopite as influenced by interlayer cation and hydration. Clays and Clay Minerals: 18: 139-149.

Weiss, C.A., Altaner, S.P., Kirkpatrick, J. (1987) High-resolution 29Si NMR spectroscopy of 2:1 layer silicates: Correlations among chemical shift, structural distortions, and chemical variations. American Mineralogist: 72: 935-942.

Internet Links for Hectorite

mindat.org URL:
https://www.mindat.org/min-1841.html
Please feel free to link to this page.

Localities for Hectorite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Brazil
 
  • Rio Grande do Norte
    • Borborema mineral province
      • Parelhas
[MinRec 29:196]
Namibia
 
  • Erongo Region
    • Karibib District
      • Okongava Ost Farm 72
Ashworth, L. (2014). Mineralised Pegmatites of the Damara Belt, Namibia: Fluid inclusion and geochemical characteristics with implications for post-collisional mineralisation (Doctoral dissertation, Faculty of Science, University of the Witwatersrand).
- Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Mineralien und Fundstellen. Edition Schloss Freudenstein, Bode Verlag, Haltern, 411 pp. (in English) ; Ashworth, L. (2014). Mineralised Pegmatites of the Damara Belt, Namibia: Fluid inclusion and geochemical characteristics with implications for post-collisional mineralisation (Doctoral dissertation, Faculty of Science, University of the Witwatersrand).
USA
 
  • Arizona
azminerals.com
      • Thompson Valley
        • Hillside
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 244; Eyde, T.H. (1986), Field trip to selected industrial mineral deposits of AZ, AZ Geol. Soc. Digest: 16: 316.
  • California
    • Inyo Co.
      • Amargosa Desert
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10188177.
    • Kern Co.
      • Kramer District (Kramer Borate District)
        • Boron
Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22(9&10): 165; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 439.
    • San Bernardino Co.
      • Cady Mts
        • Hector
American Mineralogist (1936): 21: 238-244; Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology, California Division of Mines (Report 49): 49(1-2): 157-161; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 440.
Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology, California Division of Mines (Report 49): 49(1-2): 157-161; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 440.
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Ames, Lloyd L., Jr., et al (1958), A contribution on the Hector, California bentonite deposit: Economic Geology: 53: 28; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 151; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 377.
Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology, California Division of Mines (Report 49): 49(1-2): 157-161; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 440.
  • Nevada
    • Clark Co.
      • Las Vegas District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Esmeralda Co.
NBMG Spec. Pub. 31 Minerals of Nevada
    • Humboldt Co.
NBMG Spec. Pub. 31 Minerals of Nevada
      • Montana Mts
        • Disaster District
NBMG Spec. Pub. 31 Minerals of Nevada
NBMG Spec. Pub. 31 Minerals of Nevada
  • Utah
    • Duchesne Co.
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • Juab Co.
      • Thomas Range
UGMS Bull 117 Minerals and Mineral Localities of Utah
Mineral and/or Locality  
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