SOURCE CLAY PHYSICAL/CHEMICAL DATA
Listed below are data from Data Handbook for Clay Minerals and OtherNon-metallic Minerals, edited by H.Van
Olphena and J.J. Fripiat, publishedby Pergamon Press. The
data is available only for source clay minerals,not special clay minerals. Data
shown below for special clay minerals isunofficial
data. For providing updated information, please contact TheClay Minerals Society, Leslie Shivers, Manager, P.O. Box
460130, Aurora,CO 80046-0130
SOURCE CLAY MINERALS
Kaolin KGa-1(KGa-1b), (low-defect)
ORIGIN:
LOCATION: 32o58' N-82o53' W approximately, topographic map Tabernacle, GeorgiaN 3252.5-W 8252.5/7.5, Collected from face of Coss-Hodges pit, October 3,1972.
CHEMICAL COMPOSITION (%): SiO2: 44.2, Al2O3: 39.7, TiO2: 1.39, Fe2O3: 0.13,FeO: 0.08, MnO: 0.002, MgO: 0.03, CaO: n.d., Na2O: 0.013, K2O: 0.05, F:0.013,P2O5: 0.034, Loss on
heating: -550oC: 12.6; 550-1000oC: 1.18.
CATION EXCHANGE CAPACITY (CEC): 2.0 meq/100g
SURFACE AREA: N2 area: 10.05 +/- 0.02 m2/g
THERMAL ANALYSIS: DTA: endotherm at 630oC, exotherm at 1015oC, TG: dehydroxylationweight
loss 13.11% (theory 14%) indicating less than 7% impurities.
INFRARED SPECTROSCOPY: Typical spectrum for well crystallized kaolinite,however not as well
crystallized as a typical China clay from
STRUCTURE:(Mg.02 Ca.01 Na.01 K.01)[Al3.86 Fe(III).02 Mntr
Ti.11][Si3.83Al.17]O10(OH)8, Octahedral charge:.11, Tetrahedral
charge:-.17,Interlayer charge:-.06, Unbalanced charge:0.00
Kaolin KGa-2, (high-defect)
ORIGIN: Probably lower tertiary (stratigraphic
sequence uncertain)
County of Warren, State of Georgia, USA
LOCATION: 33o19' N-82o28' W approximately, topographic map Bowdens
Pond,Georgia N 3315-W 8222.5/7.5, Collected from face
of Purvis pit, October4, 1972.
CHEMICAL COMPOSITION (%): SiO2: 43.9, Al2O3: 38.5, TiO2: 2.08, Fe2O3: 0.98,FeO: 0.15, MnO: n.d., MgO: 0.03, CaO: n.d., Na2O: <0.005, K2O:
0.065,P2O5: 0.045, S: 0.02, Loss on heating: -550oC: 12.6; 550-1000oC: 1.17,
F:0.02.
CATION EXCHANGE CAPACITY (CEC): 3.3 meq/100g
SURFACE AREA: N2 area: 23.50 +/- 0.06 m2/g
THERMAL ANALYSIS: DTA: endotherm at 625oC, exotherm at 1005oC, TG: dehydroxylationweight
loss 13.14% (theory 14%) indicating less than 7% impurities.
INFRARED SPECTROSCOPY: Typical spectrum for less crystallized kaolinite,however the mineral is not extremely disordered
since the band at 3669 cm-1is still present in the spectrum.
STRUCTURE:(Catr Ktr)[Al3.66
Fe(III).07 Mntr Mgtr
Ti.16][Si4.00]O10(OH)8, Octahedral charge:.16, Tetrahedral
charge:0.00,Interlayer charge:.16, Unbalanced charge:.15, Extra Si:.04
Palygorskite(Attapulgite)
PFl-1
ORIGIN: Hawthorne formation (miocene)
County of Gadsden, State of Florida, USA
LOCATION: SE 1/4 NW 1/4 sec. 10, T 3 N, R 3 W., topographic map Dogtown,Florida (7.5'), Collected at the Luten mine from the first foot of claybed
after stripping of overburden, October 13, 1972.
CHEMICAL COMPOSITION (%): SiO2: 60.9, Al2O3: 10.4, TiO2: 0.49, Fe2O3: 2.98,FeO: 0.40, MnO: 0.058, MgO: 10.2, CaO: 1.98, Na2O:
0.058, K2O: 0.80, F:0.542, P2O5: 0.80, S: 0.11, Loss on heating: -550oC: 8.66;
550-1000oC: 1.65.
CATION EXCHANGE CAPACITY (CEC): 19.5 meq/100g
SURFACE AREA: N2 area: 136.35 +/- 0.31 m2/g
THERMAL ANALYSIS: DTA: endotherm at 170oC, exotherm at 905oC, desorptionof water;
230-300, desorption of adsorbed water; 495oC; 550oC,
dehydroxylation;840oC . TG: Loss of absorbed water
12.96% (theory 14%), loss of structuralwater 5.52%.
INFRARED SPECTROSCOPY: The spectrum indicates fairly pure attapulgite.A
trace of quartz is detectable (780 and 800 cm-1 ). The
spectrum showsconsiderable shifts upon drying of the
sample in the OH stretching region(3000-3700 cm-1) and
in the Si-O stretching region (1000-1200 cm-1) Theseshifts are reversible.
STRUCTURE:(Mg.33Ca.62 Na.04 K.13)[Al1.50 Fe(III).52 Fe(II).01 Mn.01
Mg1.91Ti.06][Si7.88 Al.22]O20(OH)4,Octahedral charge:-1.87, Tetrahedral
charge:-.22,Interlayer charge:-2.09, Unbalanced charge:0.00
"Cheto" SAz-1 or SAz-2
ORIGIN: Bidahochi formation (pliocene)
County of Apache, State of Arizina, USA
LOCATION: SE 1/4 NW 1/4 sec. 26, T 21 N?, R 29 E., topographic map:
Gallup(1:250,000), Collected from pit after overburden was stripped, May 8,
1973.
CHEMICAL COMPOSITION (%): SiO2: 60.4, Al2O3: 17.6, TiO2: 0.24, Fe2O3: 1.42,FeO: 0.08, MnO: 0.099, MgO: 6.46, CaO: 2.82, Na2O:
0.063, K2O: 0.19, F:0.287, P2O5: 0.020, Loss on heating: -550oC: 7.54;
550-1000oC: 2.37.
CATION EXCHANGE CAPACITY (CEC): 120 meq/100g, major exchange cation Ca.
SURFACE AREA: N2 area: 97.42 +/- 0.58 m2/g
THERMAL ANALYSIS: DTA: endotherm at 200oC, exotherm at 1020, 1065, 1160oC,shoulder at 240oC , desorption of water; 685oC, dehydroxylation;
shoulderat 895oC. TG: Loss in dehydroxylation
range: 4.69% (theory 5.0%).
INFRARED SPECTROSCOPY: The spectrum indicates a low
octahedral iron content. A silica phase (band at 790 cm-1)
is detectable.
STRUCTURE:(Ca.39 Na.36 K.02)[Al2.71 Mg1.11 Fe(III).12
Mn.01Ti.03][Si8.00]O20(OH)4,Octahedral charge:-1.08, Tetrahedral
charge:0.00,Interlayer charge:-1.08, Unbalanced charge:.08,Extra Si:.01
Hectorite SHCa-1
ORIGIN: Red Mountain Andesite formation (pliocene)
County of San Bernardino, State of California, USA
LOCATION: NE 1/4 Sec. 27 T8, R5 E; topographic map: Cady Mountains (15'),
Collected from plant stockpile, November, 1972. CHEMICAL COMPOSITION (%): SiO2:
34.7, Al2O3: 0.69, TiO2: 0.038, Fe2O3:0.02, FeO:
0.25, MnO: 0.008, MgO:
15.3, CaO: 23.4, Na2O: 1.26, K2O: 0.13,Li2O: 2.18, F: 2.60, P2O5: 0.014, S: 0.01, Loss on heating:
-550oC: 1.20;550-1000oC: 20.6.
According to Steve J. Chipera and David L. Bish in Clays and Clay Minerals, 49 (5), 398-409 (2001),
SHCa-1 was found to contain approximately 50% smectite
(43% calcite, 3% dolomite, 3% quartz and 1% other).
CATION EXCHANGE CAPACITY (CEC): 43.9 meq/100g.
SURFACE AREA: N2 area: 63.19 +/- 0.50 m2/g
THERMAL ANALYSIS: DTA: endotherms at 165oC, desorption of water: shoulderat 725oC, 795oC, dehydroxylation;
880oC, decarboxylation of carbonate; shoulderat 910oC, 1130oC. TG: Ranges of dehydroxylation
and release of CO2 overlap;loss
of CO2 above 810oC indicates 27% of carbonate (calcite).
INFRARED SPECTROSCOPY: The spectrum contains strong calcite bands, whichare, however, absent in the fraction <2 um. Quartz
is detectable.
STRUCTURE:(Mg.56 Na.42 K.05)[Mg4.60 Li1.39 MntrTi.01][Si7.75 Al.17
Fe(III).05]O20(OH)4,Octahedral charge:-1.35, Tetrahedral charge:-.22,Interlayer
charge:-1.57, Unbalanced charge:.02,24.84% CaCO3 as calcite
Texas Montmorillonite STx-1
ORIGIN: Manning formation, Jackson group (eocene)
County of Gonzales, State of Texas, USA
LOCATION: 29o30' N, 97o22' W approximately, topographic map: Hamon, Texas,N 2922.5-W 9715/7.5,
Collected from face of pit, October 17, 1972.
CHEMICAL COMPOSITION (%): SiO2: 70.1, Al2O3: 16.0, TiO2: 0.22, Fe2O3: 0.65,FeO: 0.15, MnO: 0.009, MgO: 3.69, CaO: 1.59, Na2O: 0.27,
K2O: 0.078, F:0.084, P2O5: 0.026, S: 0.04, Loss on heating: -550oC: 3.32;
550-1000oC:3.22, CO2: 0.16.
CATION EXCHANGE CAPACITY (CEC): 84.4 meq/100g, major exchange cation Ca.
SURFACE AREA: N2 area: 83.79 +/- 0.22 m2/g
THERMAL ANALYSIS: DTA: endotherms at 185oC (shoulder
at 235oC), desorptionof water: 725oC, dehydroxylation; shoulder at 920oC, exotherms
at 1055oC,1065oC, 1135oC. TG: Loss in dehydroxylation
range: 3.88% (theory: 5%).
INFRARED SPECTROSCOPY: The spectrum indicates a low
iron content. Quartz(697 cm-1), a silica phase (797
cm-1), and a trace of carbonate (1400 cm-1)are detectable.
STRUCTURE:(Ca.27 Na.04 K.01)[Al2.41 Fe(III).09 Mntr Mg.71Ti..03][Si8.00]O20(OH)4,Octahedral charge:-.68,
Tetrahedral charge:0.00,Interlayer charge:-.68, Unbalanced charge:-.08,Extra
Si:.59
Na-Montmorillonite (Wyoming) SWy-1(SWy-2)
ORIGIN: Newcastle formation, (cretaceous)
County of Crook, State of Wyoming, USA
LOCATION: NE 1/4 SE 1/4 Sec.18, T 57 N, R 65 W; 8, Topographic map:
Seeley(15'), The upper 63 of recently stripped area was removed to expose clean,green upper Newcastle, Collected from which samples
was taken, October 3,1972.
CHEMICAL COMPOSITION (%): SiO2: 62.9, Al2O3: 19.6, TiO2: 0.090, Fe2O3:3.35, FeO: 0.32, MnO: 0.006, MgO: 3.05, CaO: 1.68, Na2O: 1.53,
K2O: 0.53,F: 0.111, P2O5: 0.049, S: 0.05, Loss on
heating: -550oC: 1.59; 550-1000oC:4.47, CO2: 1.33.
CATION EXCHANGE CAPACITY (CEC): 76.4 meq/100g, principal exchange cationsNa and Ca.
SURFACE AREA: N2 area: 31.82 +/- 0.22 m2/g
THERMAL ANALYSIS: DTA: endotherms at 185oC (shoulder
at 235oC), desorptionof water: 755oC, dehydroxylation; shoulder at 810oC, exotherms
at 980oC. TG: Loss in dehydroxylation range: 5.53%
(theory: 5%).
INFRARED SPECTROSCOPY: Typical spectrum for
STRUCTURE:(Ca.12 Na.32 K.05)[Al3.01 Fe(III).41 Mn.01 Mg.54Ti.02][Si7.98
Al.02]O20(OH)4,Octahedral charge:-.53, Tetrahedral charge:-.02,Interlayer
charge:-.55, Unbalanced charge:.05,
Barasym SSM-100 Syn-1
ORIGIN: Synthetic, trade name Barasym SSM-100, Baroid Division, NL Industries,date
of manufacture: 1972
CHEMICAL COMPOSITION (%): SiO2: 49.7 Al2O3: 38.2, TiO2: 0.023, Fe2O3: 0.02,MgO:
0.014, Na2O: 0.26, K2O: <0.01, Li2O; 0.25, F: 0.76, P2O5: 0.001,S: 0.10,
Loss on heating: -550oC: 8.75; 550-1000oC: 2.4.
CATION EXCHANGE CAPACITY (CEC): Barium method ca.70 meq/100g; ammonium methodca. 140 meq/100g.
SURFACE AREA: N2 area: 133.66 +/- 0.72 m2/g
THERMAL ANALYSIS: DTA: endotherms at 140oC, desorption of water: 575oC,dehydroxylation;
exotherms at 1030oC. TG: The weight loss in dehydroxylationrange: 10.35% due to simultaneous loss of
ammonium which is the major exchangecation.
INFRARED SPECTROSCOPY: The spectrum is broadly similar to that of muscoviteand contains bands due to NH4 (
1432 and 1404 cm-1) and to NH4Br from thereaction
in the KBr disk.
STRUCTURE:(Mg.06 Ca.04 Na.12 Ktr)[Al3.99 Fe(III)tr MntrTitr][Si6.50
Al1.50]O20(OH)4,Octahedral charge:.01, Tetrahedral charge:-1.50,Interlayer
charge:-1.49, Unbalanced charge:-1.17,Extra Al:.40
SPECIAL CLAY MINERALS
Ripidolite(Chlorite) CCa-2
ORIGIN: Flagstaff Hill, El Dorado County, California, USA
CHEMICAL COMPOSITION (%): SiO2: 26.0 Al2O3: 20.0, TiO2: 0.476, Fe2O3:26.6, FeO: 20.8, MnO: 0.1, MgO: 17.2, CaO: 0.25, Na2O:
<0.1, K2O: ><0.1, P2O5: 0.02, LOI: 9.32>STRUCTURE:(Ca.05)[Mg4.44 Al.60
Fe(III)3.47 Fe(II)3.02 Mn.01Ti.06][Si4.51 Al13.49]O20(OH)16,Lacks Mg:.40
Montmorillonite (Otay)
SCa-3
ORIGIN: Otay San Diego County, California, USA
CHEMICAL COMPOSITION (%): SiO2: 52.8 Al2O3: 15.7, TiO2: 0.181, Fe2O3:1.06, FeO:
<0.10, MnO: 0.03, MgO: 7.98, CaO: 0.95, Na2O: 0.92, K2O: 0.03,P2O5: 0.02, LOI: 21.2>STRUCTURE:(Mg.45
Ca.15 Na.26 K.01)[Al2.55 Fe(III).12 Mntr Mg1.31 Ti.02
][Si7.81 Al.19]O20(OH)4,Octahedral charge:-1.29, Tetrahedral
charge:-0.19,Interlayer charge:-1.48, Unbalanced charge:0.00,
Ferruginous Smectite SWa-1
ORIGIN: Grant County, Washington, USA
CHEMICAL COMPOSITION (%): SiO2: 43.75 Al2O3: 7.95, TiO2: 0.54, Fe2O3:25.25, FeO: 0, MnO: 0.03, MgO: 1.75, CaO: 2.05, Na2O: 0,
K2O: 0.03,P2O5: 0.05, LOI: 19.35
STRUCTURE:(Mg.18 Ca.36 K.01)[Al.61 Fe(III)3.08 Mntr
Mg.24 Ti.07][Si7.09 Al.91]O20(OH)4,Octahedral charge:-.18, Tetrahedral
charge:-.91,Interlayer charge:-1.09, Unbalanced charge:0.00,
Vermiculite (Llano) VTx-1
ORIGIN: Liano County, Texas, USA
CHEMICAL COMPOSITION (%): SiO2: 27.8 Al2O3: 0.59, TiO2: 0.047, Fe2O3:1.12, FeO:
<0.10, MnO: 0.08, MgO: 29.7, CaO: 14.6, Na2O: ><.01, K2O: 0.03,P2O5: 0.03, LOI: 26.2>STRUCTURE:(Mg2.27
Ca2.92 K.01)[Mg5.98 Mn.01 Ti.01][Si7.71 Al.13Fe(III).16]O20(OH)4,Octahedral
charge:.02, Tetrahedral charge:-0.29,Interlayer charge:-.27, Unbalanced
charge:+10.12,Lacks Si:2.53
Illite IMt-1 and IMt-2
ORIGIN: Silver Hill, Montana, USA
CHEMICAL COMPOSITION (%): SiO2: 49.3 Al2O3: 24.25, TiO2: 0.55, Fe2O3:7.32, FeO: 0.55, MnO: 0.03, MgO: 2.56, CaO: 0.43, Na2O: 0,
K2O: 7.83,P2O5: 0.08, LOI: 8.02
STRUCTURE:(Mg.09 Ca.06 K1.37)[Al2.69 Fe(III).76 Fe(II).06 Mntr
Mg.43 Ti.06][Si6.77 Al1.23]O20(OH)4,Octahedral charge:-.44, Tetrahedral
charge:-1.23,Interlayer charge:-1.68, Unbalanced charge:0.00
Illit-Smectite Mixed Layer (60/40 ordered)
ISMt-2
ORIGIN: Mancos shale Cretaceous
CHEMICAL COMPOSITION (%): SiO2: 51.2 Al2O3: 26.3, TiO2: 0.17, Fe2O3:1.49, FeO: 0.1, MnO: 0.01, MgO: 2.41, CaO: 1.4, Na2O: 0.04,
K2O: 4.74,P2O5: 0.05, LOI: 12.6
STRUCTURE:(Mg.05 Ca.21 Na.01 K.84)[Al3.37 Fe(III).16 Fe(II).01 Mntr Mg.45Ti.02][Si7.08 Al.92]O20(OH)4,Octahedral
charge:-.44, Tetrahedral charge:-.92,Interlayer charge:-1.36, Unbalanced
charge:0.00
Illit-Smectite Mixed Layer (70/30 ordered)
ISCz-1
ORIGIN: Czechoslovakia
CHEMICAL COMPOSITION (%): SiO2: 51.6 Al2O3: 25.6, TiO2: 0.039, Fe2O3:1.11, FeO:
<0.1, MnO: 0.04, MgO: 2.46, CaO: 0.67, Na2O: 0.32, K2O: 5.36,P2O5: 0.04, LOI: 10.2>STRUCTURE:(Mg.03
Ca.1 Na.09 K.95)[Al3.39 Fe(III).12 Mntr
Mg.48Titr][Si7.19 Al.81]O20(OH)4,Octahedral charge:-.48, Tetrahedral
charge:-.81,Interlayer charge:-1.29, Unbalanced charge:0.00
Nontronite NG-1
ORIGIN: Hohen Hagen, Germany
CHEMICAL COMPOSITION (%): SiO2: 45.8 Al2O3: 5.93, TiO2: 0.05, Fe2O3:32.2, FeO: 0, MnO: 0.01, MgO: 1.02, CaO: 1.95, Na2O: 0.03,
K2O: 0.13,P2O5: 0.02, LOI: 13.4
STRUCTURE:(Mg.15 Ca.32 Na.01 K.03)[Fe(III)3.75 Al.17 Mntr
Mg.08Ti.01][Si7.08 Al.92]O20(OH)4,Octahedral charge:-.08, Tetrahedral
charge:-.92,Interlayer charge:-.99, Unbalanced charge:0.00
Corrensite CorWa-1
ORIGIN: Pachwook, Washington, USA
CHEMICAL COMPOSITION (%): SiO2: 44.0 Al2O3: 15.4, TiO2: 1.26, Fe2O3:13.9, FeO: 4.5, MnO: 0.32, MgO: 6.24, CaO: 3.44, Na2O: 3.44,
K2O: 0.59,P2O5: 0.22, LOI: 12.3
STRUCTURE:(Ca1.2 Na2.17 K.25)[Al4.24 Fe(III)3.41 Fe(II)1.23 Mn.09Mg3.03
Ti.31][Si14.33 Al1.67]O40(OH)20,Octahedral charge:-4.03, Tetrahedral
charge:-1.67,Interlayer charge:-5.70, Unbalanced charge:-.88
Saponite SapCa-2
ORIGIN: Ballarat, California, USA
CHEMICAL COMPOSITION (%): SiO2: 47.9 Al2O3: 4.17, TiO2: 0.029, Fe2O3:0.66, FeO:
<0.1, MnO: 0.05, MgO: 26.1, CaO: 0.9, Na2O: 2.73, K2O: 0.39,P2O5: 0.03, LOI: 12.6>STRUCTURE:(Ca1.14
Na.79 K.07)[Mg5.98 Mn.01 Titr][Si7.19
Al.74Fe(III).07]O20(OH)4,Octahedral charge:+.02, Tetrahedral
charge:-.81,Interlayer charge:-.79, Unbalanced charge:+.35Lacks Si:.01, Lacks
Mg:.15
Sepiolite SepSp-1
ORIGIN: Valdemore, Spain
CHEMICAL COMPOSITION (%): SiO2: 52.9 Al2O3: 2.56, TiO2:
<.001, Fe2O3:1.22, FeO: 0.3, MnO: 0.13, MgO: 23.6, CaO: ><.01, Na2O: ><0.01, K2O: 0.05,P2O5: 0.01, LOI: 20.8>STRUCTURE:(K.01)[Mg5.54
Al.35 Mn.02 Fe(II).04 Fe(III).14][Si7.90 Al.1]O20(OH)4,Octahedral charge:+.49,
Tetrahedral charge:-.10,Interlayer charge:+.39, Unbalanced charge:+.40Lacks
Mg:.20
Sepiolite SepNev-1
ORIGIN: Two Crows, Nevada, USA
CHEMICAL COMPOSITION (%): SiO2: 54.0 Al2O3: 0.5, TiO2:
<.001, Fe2O3: 0.81, FeO: ><0.1, MnO: 0.11, MgO: 23.3, CaO: 1.25, Na2O: 2.1, K2O: 0.15,P2O5: 0.02, LOI: 19.2>STRUCTURE:(Ca.2
Na.6 K.03)[Mg5.81 Al.09 Mn.01 Fe(III).09][Si8.00]O20(OH)4,Octahedral
charge:+.18, Tetrahedral charge:0.0,Interlayer charge:+.18, Unbalanced
charge:+1.03Extra Si: 0.02 Lacks Mg:.65
Beidellite, SBCa-1
ORIGIN: California, USA
CHEMICAL COMPOSITION (%): SiO2: 46.45 Al2O3: 27.95, TiO2: 0.517, Fe2O3:2.13, FeO: 0.1, MnO: 0.08, MgO: 0.94, CaO: 1.01, Na2O:
<.01, K2O: 0.72,P2O5: 0.11, LOI: 20.25>STRUCTURE:(Mg.3 Ca.16 K.15)[Al3.82
Fe(III).18 Mntr
Ti.06][Si6.80Al1.20]O20(OH)4,Octahedral charge:+.12, Tetrahedral
charge:-1.20,Interlayer charge:-1.08, Unbalanced charge:0.0
Beidellite, SBId-1
ORIGIN: Idaho, USA
STRUCTURE:Si3.772, Al(IV).228, Al(VI)1.786, Fe(III).104, Mg(VI).046
Mn.001Ti.048 Na.012 K.159,.050.Also see Post et al, 1997, Clays and Clay
Minerals 45:240-250
Nontronite NAu-1
ORIGIN: South Australia
CHEMICAL COMPOSITION (%): SiO2: 53.33 Al2O3: 10.22, Fe2O3: 34.19MgO: 0.27, CaO: 3.47, Na2O: 0.08, K2O: 0.03
STRUCTURE:(M+1.0)[Si7.00 Al1.00][Al.58 Fe3.38 Mg.05]Also see Keeling, J.L.et al. 2000 "Geology and perliminarycharacterization
of two nontronites from Uley
graphite mine, South Australia"Clays and Clay
Minerals.
Nontronite NAu-2
ORIGIN:
CHEMICAL COMPOSITION (%): SiO2: 56.99 Al2O3: 3.4, Fe2O3: 37.42MgO: 0.34, CaO: 2.67, Na2O: 0.11, K2O: 0.02
STRUCTURE:(M+.97)[Si7.57 Al.01 Fe.42][Al.52 Fe3.32
Mg.7]O20(OH)4Also see Keeling, J.L.et al. 2000
"Geology and perliminarycharacterization of two nontronites from Uley graphite
mine,
Synthetic Hectorite SYnH-1
ORIGIN: United Catalysts Inc.
CHEMICAL COMPOSITION (%): SiO2: 57-61MgO: 25-29 Li2O 0.5-0.9, Na2O: 2.5-3.5,
LOI: <10
DENSITY: 2.5g/cm3
MOISTURE CONTENT: 12%
Illite IWi-1
ORIGIN:
CHEMICAL COMPOSITION: See Grathoff et al. 1995.
Abstract of 32ndAnnual Clay Minerals Society Meeting