Mineralogy Database

Bannermanite Mineral Data

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General Bannermanite Information

Help on Chemical  Formula: Chemical Formula: (Na,K)0.7V+++++6O15
Help on Composition: Composition: Molecular Weight = 564.95 gm
   Potassium   1.38 %  K     1.67 % K2O
   Sodium      2.03 %  Na    2.74 % Na2O
   Vanadium   54.10 %  V    96.58 % V2O5
   Oxygen     42.48 %  O
             ______        ______ 
             100.00 %      100.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.5K0.2V5+6O15
Help on Environment: Environment: In fumaroles.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Izalco volcano, El Salvador. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Harold M. Bannerman (1897-1976), U. S. Economic Geologist.
Help on Name Pronunciation: Name Pronunciation: Bannermanite + Pronunciation Say BANNERMANITE
Help on Synonym: Synonym: ICSD 31208
  PDF 35-713

Bannermanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.2636:1:2.7845
Help on Cell Dimensions: Cell Dimensions: a = 15.413, b = 3.615, c = 10.066, Z = 2; beta = 109.29° V = 529.37 Den(Calc)= 3.54
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): 3.367(1), 7.24(1), 3.068(0.8),

Physical Properties of Bannermanite

Help on Cleavage: Cleavage: {100} Perfect, {010} Fair
Help on Color: Color: Black.
Help on Density: Density: 3.5
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: brownish black

Optical Properties of Bannermanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.339,KPDmeas= 0.3429,KC= 0.3369
Ncalc = 2.18 - 2.19
Help on Optical Data: Optical Data: Biaxial (?), b=2.2

Calculated Properties of Bannermanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Bannermanite =3.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0015581015
Boson Index = 0.9984418985
Help on Photoelectric: Photoelectric: PEBannermanite = 10.68 barns/electron
U=PEBannermanite x relectron= 35.76 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 18.88 (Gamma Ray American Petroleum Institute Units)
Concentration of Bannermanite per GRapi unit = 5.30 (%)

Estimated Radioactivity from Bannermanite - barely detectable


Bannermanite Classification

Help on  Dana Class: Dana Class: (47)Vanadium Oxysalts
  (47.03.05)Dana Group Bannermanite (Na,K)0.7V6O15 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.HF.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.H - V[5,6] Vanadates
  04.HF -Tektovanadates
04.HF.05 Bannermanite (Na,K)0.7V6O15 C 2/m 2/m

Other Bannermanite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Bannermanite :
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.HF.05





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