Montmorillonite  Mineral Data

Montmorillonite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About

Advertisment
John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.
Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.
A Bijoux.com is an online store specialized in the sale on the internet of precious stones , gems , minerals and jewels for individuals and professionals
Exceptional Minerals features excellent, high quality mineral specimens for sale. We also have a weekly Best Offer Mineral Auction.

General Montmorillonite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O)
Help on Composition: Composition: 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
Help on Empirical Formula: Empirical Formula: Na0.2Ca0.1Al2Si4O10(OH)2(H2O)10
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1847
Help on Locality: Locality: Veinne, Montmorillone, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Name Pronunciation: Name Pronunciation: Montmorillonite + Pronunciation Say MONTMORILLONITE
Help on Synonym: Synonym: Bentonite
 

Montmorillonite Image

Click Here for Larger Montmorillonite Image in a New Browser Window Images:
Click Here for Larger Montmorillonite Image

Montmorillonite

Comments: Authigenic smectite (montmorillonite) overgrown on pore spaces and authigenicly-overgrown quartz grains in a sandstone. SEM image of a core sample.
Location: Unknown. Scale: Picture size 67 µ-m.
© OMNI Laboratories, Inc

Click Here for Larger Montmorillonite Image in a New Browser Window Images:
Click Here for Larger Montmorillonite Image

Montmorillonite

Comments: Bright pink chalky massive montmorillonite.
Location: Tamminen Quarry, Greenwood, Oxford County, Maine, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Montmorillonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5782:1:1.1129
Help on Cell Dimensions: Cell Dimensions: a = 5.17, b = 8.94, c = 9.95, Z = 1; beta = 99.9° V = 453.04 Den(Calc)= 2.01
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Click Here for Large Montmorillonite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate

Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above


Viani A , Gualtieri A , Artioli G , American Mineralogist , 87 (2002) p.966-975, The nature of disorder in montmorillonite by simulation of X-ray powder patterns, Note: Structural simulation model

 

Physical Properties of Montmorillonite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: White, Gray white, Yellow, Brownish yellow, Greenish yellow.
Help on Density: Density: 2 - 2.7, Average = 2.35
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white
 

Optical Properties of Montmorillonite

Help on Gladstone-Dale: Gladstone-Dale: 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
Ncalc = 1.51 - 1.69
Help on Optical Data: Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Montmorillonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.08 gm/cc
note: Specific Gravity of Montmorillonite =2.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0098785928
Boson Index = 0.9901214072
Help on Photoelectric: Photoelectric: PEMontmorillonite = 1.26 barns/electron
U=PEMontmorillonite x rElectron Density= 2.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montmorillonite is Not Radioactive
 

Montmorillonite Classification

Help on  Dana Class: Dana Class: 71.03.01a.02 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.03)with 2:1 clays
  (71.03.01a)Smectite group (Dioctahedral Smectites)
 
71.03.01a.01 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) C 2/m or ORTH 2/m
 
71.03.01a.02 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O) C 2/m 2/m
 
71.03.01a.03 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2•n(H2O) C 2/m 2/m
 
71.03.01a.04 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
 
71.03.01a.05 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O) C 2/m (MON or ORTH) 2/m
Help on  Strunz Class: Strunz Class: 09.EC.40 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
 
09.EC.40 Almbosite? Fe5Fe4V4Si3O27 Ortho ? Ortho
 
09.EC.40 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) C 2/m or ORTH 2/m
 
09.EC.40 Kurumsakite (Zn,Ni,Cu)8Al8V2Si5O35•27(H2O)(?) Unk Ortho
 
09.EC.40 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O) C 2/m 2/m
 
09.EC.40 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2•n(H2O) C 2/m 2/m
 
09.EC.40 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
 
09.EC.40 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m
 

Other Montmorillonite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: 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 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - Scandinavian mineral gallery

Search for Montmorillonite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Montmorillonite :

A Bijoux Google Search for Montmorillonite
Adam's Minerals Google Search for Montmorillonite
Cape Minerals Google Search for Montmorillonite
Dakota Matrix Minerals Google Search for Montmorillonite
Excalibur Mineral Corp. Google Search for Montmorillonite
Exceptional Minerals Google Search for Montmorillonite
John Betts Fine Minerals Search for Montmorillonite
McDougall Minerals Google Search for Montmorillonite
Mineral News Website Link
Rock and Mineral Shows Google Search for Montmorillonite
Weinrich Minerals, Inc. Google Search for Montmorillonite

Ask about Montmorillonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Montmorillonite Specimen Label here :

Montmorillonite

(Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O)
Dana No: 71.03.01a.02 Strunz No: 09.EC.40
Locality:

 

Notes: