Bentorite  Mineral Data

Bentorite Mineral Data

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

Advertisment
McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs
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.
Hudson Institute of Mineralogy
Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

General Bentorite Information

Help on Chemical  Formula: Chemical Formula: Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O)
Help on Composition: Composition: Molecular Weight = 1,292.63 gm
   Calcium   18.60 %  Ca   26.03 % CaO
   Aluminum   1.04 %  Al    1.97 % Al2O3
   Chromium   6.03 %  Cr    8.82 % Cr2O3
   Hydrogen   4.99 %  H    44.60 % H2O
   Sulfur     7.44 %  S    18.58 % SO3
   Oxygen    61.89 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca6Cr1.5Al0.5(SO4)3(OH)12•26(H2O)
Help on Environment: Environment: Low-temperature hydrothermal veins in black calcite–spurrite marble.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Marble quarry in the Hatrurim Formation, near the Arad-Sodom road, Negev Desert, Israel. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Y.K. Bentor, Professor at the University of California, San Diego, California, USA, for his contributions to geology and mineralogy in Israel.
Help on Name Pronunciation: Name Pronunciation: Bentorite + Pronunciation Say BENTORITE
 

Bentorite Image

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

Bentorite

Comments: Violet crystalline bentorite.
Location: Hatrurim Area, West of Dead Sea, Israel. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bentorite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.95794
Help on Cell Dimensions: Cell Dimensions: a = 22.35, c = 21.41, Z = 8; V = 9,261.95 Den(Calc)= 1.85
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.656(1), 5.592(0.4), 1.942(0.2),
 

Physical Properties of Bentorite

Help on Cleavage: Cleavage: {1010} Perfect
Help on Color: Color: Violet, Light violet.
Help on Density: Density: 2.025
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: violet
 

Optical Properties of Bentorite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.116 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.26,KPDmeas= 0.2375,KC= 0.2688
Ncalc = 1.5 - 1.54
Help on Optical Data: Optical Data: Uniaxial (+), w=1.478, e=1.484, bire=0.0060.
 

Calculated Properties of Bentorite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.93 gm/cc
note: Specific Gravity of Bentorite =1.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0068459104
Boson Index = 0.9931540896
Help on Photoelectric: Photoelectric: PEBentorite = 4.06 barns/electron
U=PEBentorite x rElectron Density= 7.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bentorite is Not Radioactive
 

Bentorite Classification

Help on  Dana Class: Dana Class: 31.10.02.02 (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10)miscellaneous
  (31.10.02)Dana Group
 
31.10.02.01 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
 
31.10.02.02 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
 
31.10.02.03 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31c 3m
Help on  Strunz Class: Strunz Class: 07.DG.15 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
 
07.DG.15 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
 
07.DG.15 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m
 
07.DG.15 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
 
07.DG.15 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m
 
07.DG.15 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m
 
07.DG.15 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m
 
07.DG.15 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31c 3m
 
07.DG.15 Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex
 

Other Bentorite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bentorite :
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 Bentorite using:

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

Visit our Advertisers for Bentorite :

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

Ask about Bentorite 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 Español

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

Bentorite

Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O)
Dana No: 31.10.02.02 Strunz No: 07.DG.15
Locality:

 

Notes: