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Bahianite Mineral Data

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General Bahianite Information

Help on Chemical  Formula: Chemical Formula: Al5Sb+++++3O14(OH)2
Help on Composition: Composition: Molecular Weight = 758.16 gm
   Aluminum  17.79 %  Al   33.62 % Al2O3
   Antimony  48.18 %  Sb   64.00 % Sb2O5
   Hydrogen   0.27 %  H     2.38 % H2O
   Oxygen    33.76 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al5Sb3O14(OH)2
Help on Environment: Environment: In potholes as stream-worn pebbles and as residual concentrates above weathered volcanic rock.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: About eight km southeast of the village of Paramirim das Crioulas, and elsewhere in the region around Rio do Picos das Almas, Serra das Almas, south-central Bahia, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Bahianite + Pronunciation Say BAHIANITE
Help on Synonym: Synonym: ICSD 14050
  PDF 29-2

Bahianite Image

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Comments: Rounded grain of bahianite.
Location: Garimpo de Morro, Paramirim Region, Bahia, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bahianite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.815:1:0.3821
Help on Cell Dimensions: Cell Dimensions: a = 9.406, b = 11.541, c = 4.41, Z = 2; beta = 90.94° V = 478.66 Den(Calc)= 5.26
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): 3.194(1), 3.24(1), 2.156(0.8),

Physical Properties of Bahianite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Colorless, Violet, Cream white, Light brown.
Help on Density: Density: 4.89 - 5.46, Average = 5.17
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 9 - Corundum
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Bahianite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1648,KPDmeas= 0.1675,KC= 0.1756
Ncalc = 1.86 - 1.96
Help on Optical Data: Optical Data: Biaxial (-), a=1.81, b=1.87, g=1.92, bire=0.1100

Calculated Properties of Bahianite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.75 gm/cc
note: Specific Gravity of Bahianite =5.18 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001624685
Boson Index = 0.9998375315
Help on Photoelectric: Photoelectric: PEBahianite = 154.92 barns/electron
U=PEBahianite x rElectron Density= 735.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bahianite is Not Radioactive

Bahianite Classification

Help on  Dana Class: Dana Class: (44)Antimonates
  (44.03)with miscellaneous formulae
  (44.03.07)Dana Group Bahianite Al5Sb3O14(OH)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DC -With medium-sized cations; sheets of edge-sharing octahedra
04.DC.05 Bahianite Al5Sb3O14(OH)2 C 2/m 2/m

Other Bahianite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Bahianite :
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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Dana No: Strunz No: 04.DC.05





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