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Nontronite Mineral Data

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General Nontronite Information

Help on Chemical  Formula: Chemical Formula: Na0.3Fe+++2(Si,Al)4O10(OH)2•n(H2O)
Help on Composition: Composition: Molecular Weight = 495.90 gm
   Sodium     1.39 %  Na    1.87 % Na2O
   Aluminum   5.44 %  Al   10.28 % Al2O3
   Iron      22.52 %  Fe   32.20 % Fe2O3
   Silicon   16.99 %  Si   36.35 % SiO2
   Hydrogen   2.03 %  H    18.16 % H2O
   Oxygen    51.62 %  O
            ______        ______ 
            100.00 %       98.87 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.3Fe3+2Si3AlO10(OH)2•4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1827
Help on Locality: Locality: Nontrone, Dordogne, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Nontronite + Pronunciation Say NONTRONITE
Help on Synonym: Synonym: Chloropal
  ICSD 86916
 

Nontronite Image

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  Nontronite

Comments: Green massive nontronite in quartz.
Location: Horni Slavkov, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nontronite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.574:1:1.6739
Help on Cell Dimensions: Cell Dimensions: a = 5.23, b = 9.11, c = 15.25, Z = 2; beta = 96° V = 722.61 Den(Calc)= 2.28
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.52(1), 4.56(1), 15.4(1),
 

Physical Properties of Nontronite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Greenish yellow, Brownish green, Olive green.
Help on Density: Density: 2.3
Help on Diaphaneity: Diaphaneity: Subopaque
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 Nontronite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2523,KPDmeas= 0.2501,KC= 0.2636
Ncalc = 1.6 - 1.61
Help on Optical Data: Optical Data: Biaxial (-), a=1.53-1.58, b=1.555-1.612, g=1.56-1.615, bire=0.0300-0.0350, 2V(Calc)=32-46, 2V(Meas)=5-66. Dispersion r > v strong.
Help on Pleochroism (x): Pleochroism (x): yellowish green or yellowish green.
Help on Pleochroism (y): Pleochroism (y): olive green or brownish green.
Help on Pleochroism (z): Pleochroism (z): olive green or brownish green.
 

Calculated Properties of Nontronite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.28 gm/cc
note: Specific Gravity of Nontronite =2.28 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PENontronite = 7.45 barns/electron
U=PENontronite x rElectron Density= 17.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nontronite is Not Radioactive
 

Nontronite Classification

Help on  Dana Class: Dana Class: 71.03.01a.03 (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 Nontronite 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 Nontronite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
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 - WWW-MINCRYST

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Nontronite

Na0.3Fe+++2(Si,Al)4O10(OH)2•n(H2O)
Dana No: 71.03.01a.03 Strunz No: 09.EC.40
Locality:

 

Notes:

 

 
   
 


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