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Montmorillonite Mineral Data + |
General Montmorillonite Information |
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| (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O) | |||
| Molecular Weight = 549.07 gm | |||
| Sodium 0.84 % Na 1.13 % Na2O | |||
| Calcium 0.73 % Ca 1.02 % CaO | |||
| Aluminum 9.83 % Al 18.57 % Al2O3 | |||
| Silicon 20.46 % Si 43.77 % SiO2 | |||
| Hydrogen 4.04 % H 36.09 % H2O | |||
| Oxygen 64.11 % O | |||
| ______ ______ | |||
| 100.00 % 100.58 % = TOTAL OXIDE | |||
| Na0.2Ca0.1Al2Si4O10(OH)2(H2O)10 | |||
| Valid Species (Pre-IMA) 1847 | |||
| Veinne, Montmorillone, France. Link to MinDat.org Location Data. | |||
| Named after the locality. | |||
| Bentonite | |||
Montmorillonite Image | |||
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Montmorillonite Crystallography |
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| a:b:c =0.5782:1:1.1129 | |||
| a = 5.17, b = 8.94, c = 9.95, Z = 1; beta = 99.9° V = 453.04 Den(Calc)= 2.01 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m | |||
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Physical Properties of Montmorillonite |
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| [001] Perfect | |||
| White, Gray white, Yellow, Brownish yellow, Greenish yellow. | |||
| 2 - 2.7, Average = 2.35 | |||
| Translucent to Opaque | |||
| Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite). | |||
| Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | |||
| 1.5-2 - Talc-Gypsum | |||
| None. | |||
| Earthy (Dull) | |||
| white | |||
Optical Properties of Montmorillonite |
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| CI meas= 0.135 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2595,KPDmeas= 0.2219,KC= 0.2565 |
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| Biaxial (-), a=1.485-1.535, b=1.504-1.55, g=1.505-1.55, bire=0.0150-0.0200, 2V(Calc)=0-24, 2V(Meas)=5-30. Dispersion none. | |||
| colorless. | |||
| colorless. | |||
| colorless. | |||
Calculated Properties of Montmorillonite |
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relectron=2.08 gm/cc |
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| Fermion Index = 0.00987 Boson Index = 0.99013 |
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PEMontmorillonite = 1.26 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Montmorillonite is Not Radioactive |
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Montmorillonite Classification |
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| 71.3.1a.2 (71)Phyllosilicate Sheets of Six-Membered Rings | |||
| (71.3)with 2:1 clays | |||
| (71.3.1a)Smectite group (Dioctahedral Smectites) | |||
| VIII/H.19-20 VIII - Silicates | |||
| VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups | |||
| VIII/H.19 - Brammallite ? - Yakhontovite series | |||
Other Montmorillonite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | |||
| Links to other databases for Montmorillonite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 -Athena 6 - Crocoite.com Mineral Locations 7 - EUROmin Project 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Minerals of Wisconsin 17 -QUT Mineral Atlas 18 - Scandinavian mineral gallery 19 - University of Manchester - Mineral Structure 20 -École des Mines de Paris Search for Montmorillonite using: Visit our Advertisers for Montmorillonite : Translate Montmorillonite Mineral Data : Ask about Montmorillonite here : Print or Cut-and-Paste your Montmorillonite Specimen Label here :
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