Mineralogy Database

Beidellite Mineral Data

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General Beidellite Information

Help on Chemical  Formula: Chemical Formula: Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O)
Help on Composition: Composition: Molecular Weight = 389.27 gm
   Sodium     2.95 %  Na    3.98 % Na2O
   Aluminum  17.33 %  Al   32.74 % Al2O3
   Silicon   25.25 %  Si   54.02 % SiO2
   Hydrogen   1.04 %  H     9.26 % H2O
   Oxygen    53.43 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.5Al2.5Si3.5O10(OH)2•(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1925
Help on Locality: Locality: Beidell, Colorado, USA.. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Beidellite + Pronunciation Say BEIDELLITE
Help on Synonym: Synonym: Bentonite
  Montmorillonite(Ca)
  Montmorillonite(Na)
 

Beidellite Image

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  Beidellite

Comments: Pure white chalky massive beidellite.
Location: From near Charlestown, Nevis, Saint Kitts and Nevis, West Indies. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Beidellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5755:1:1.6797
Help on Cell Dimensions: Cell Dimensions: a = 5.14, b = 8.93, c = 15, Z = 2; beta = 99.54° V = 678.98 Den(Calc)= 1.90
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m or ORTH
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.55(1), 2.61(1), 4.52(1),
 

Physical Properties of Beidellite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: White, Gray, Reddish white, Brownish white, Pale yellow.
Help on Density: Density: 2 - 2.3, Average = 2.15
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white
 

Optical Properties of Beidellite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.101 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.246 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2731,KPDmeas= 0.2413,KC= 0.2192
Ncalc = 1.42 - 1.5
Help on Optical Data: Optical Data: Biaxial (-), a=1.494-1.503, b=1.525-1.532, g=1.526-1.533, bire=0.0300-0.0320, 2V(Calc)=20, 2V(Meas)=9-16. Dispersion none.
 

Calculated Properties of Beidellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.15 gm/cc
note: Specific Gravity of Beidellite =2.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBeidellite = 1.54 barns/electron
U=PEBeidellite x rElectron Density= 3.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Beidellite is Not Radioactive
 

Beidellite Classification

Help on  Dana Class: Dana Class: 71.03.01a.01 (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 Beidellite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Beidellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Beidellite

Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O)
Dana No: 71.03.01a.01 Strunz No: 09.EC.40
Locality:

 

Notes:

 

 
   
 


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