[How the Club Works] [Memberships - Junior, Deluxe , and Platinum] [FAQ] [Past Minerals] Join the Club - Junior, Deluxe and Platinum Memberships Available High Quality Minerals Sent to Your Home or School Each Month Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals General Beidellite InformationNa0.5Al2(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 Crystallographya: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 BeidelliteCI 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 BeidelliteBulk 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 Classification71.03.01a.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 InformationNAME( 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 - Google Images 6 - Google Scholar 7 - Handbook of Mineralogy (MinSocAm) 8 - Handbook of Mineralogy (UofA) 9 - MinDAT 10 - MinMax(Deutsch) 11 - MinMax(English) 12 - Mineralienatlas (Deutsch) 13 - QUT Mineral Atlas 14 - Ruff.Info Search for Beidellite using: Visit our Advertisers for Beidellite : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Beidellite Mineral Data : Ask about Beidellite here : Print or Cut-and-Paste your Beidellite Specimen Label here :
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