General Beidellite Information![]() Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) |
![]() Molecular Weight = 389.27 gm |
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Sodium 2.95 % Na 3.98 % Na2O |
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Aluminum 17.33 % Al 32.74 % Al2O3 |
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Silicon 25.25 % Si 54.02 % SiO2 |
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Hydrogen 1.04 % H 9.26 % H2O |
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Oxygen 53.43 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
![]() Na0.5Al2.5Si3.5O10(OH)2•(H2O) |
![]() Valid Species (Pre-IMA) 1925 |
![]() Beidell, Colorado, USA.. Link to MinDat.org Location Data. |
![]() Named after its locality. |
![]() Beidellite + Pronunciation |
![]() ![]() Bentonite |
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Montmorillonite(Ca) |
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Montmorillonite(Na) |
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Beidellite Crystallography![]() a:b:c =0.5755:1:1.6797 |
![]() a = 5.14, b = 8.93, c = 15, Z = 2; beta = 99.54° V = 678.98 Den(Calc)= 1.90 |
![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m or ORTH |
![]() By Intensity(I/Io): 2.55(1), 2.61(1), 4.52(1), |
| Physical Properties of Beidellite![]() {001} Perfect |
![]() White, Gray, Reddish white, Brownish white, Pale yellow. |
![]() 2 - 2.3, Average = 2.15 |
![]() Translucent to subtranslucent |
![]() Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
![]() 1-2 - Between Talc and Gypsum |
![]() Non-fluorescent. |
![]() Earthy (Dull) |
![]() white |
| Optical Properties of Beidellite![]() 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 ![]() 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![]() Bulk Density (Electron Density)=2.15 gm/cc |
note: Specific Gravity of Beidellite =2.15 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PEBeidellite = 1.54 barns/electron |
U=PEBeidellite x rElectron Density= 3.32 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Beidellite is Not Radioactive | Beidellite Classification![]() 71.03.01a.01 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.03)with 2:1 clays |
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(71.03.01a)Smectite group (Dioctahedral Smectites) |
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![]() 09.EC.40 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets |
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| Other Beidellite Information![]() NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
![]() 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 Search for Beidellite using: Visit our Advertisers for Beidellite : A Bijoux Google Search for BeidelliteAdam's Minerals Google Search for Beidellite Cape Minerals Google Search for Beidellite Dakota Matrix Minerals Google Search for Beidellite Excalibur Mineral Corp. Google Search for Beidellite Exceptional Minerals Google Search for Beidellite John Betts Fine Minerals Search for Beidellite McDougall Minerals Google Search for Beidellite Mineral News Website Link Rock and Mineral Shows Google Search for Beidellite Weinrich Minerals, Inc. Google Search for Beidellite Ask about Beidellite here : Print or Cut-and-Paste your Beidellite Specimen Label here :
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