Bannermanite Mineral Data

General Bannermanite Information

Chemical Formula:

(Na,K)0.7V+++++6O15

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

Empirical Formula:

Na_0.5K_0.2V⁵⁺₆O₁₅

Environment:

In fumaroles.

IMA Status:

Approved IMA 1981

Locality:

Izalco volcano, El Salvador. Link to MinDat.org Location Data.

Name Origin:

Named for Harold M. Bannerman (1897-1976), U. S. Economic Geologist.

Name Pronunciation:

Bannermanite + Pronunciation

Synonym:

ICSD 31208

PDF 35-713

Bannermanite Crystallography

Axial Ratios:

a:b:c =4.2636:1:2.7845

Cell Dimensions:

a = 15.413, b = 3.615, c = 10.066, Z = 2; beta = 109.29° V = 529.37 Den(Calc)= 3.54

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/I_o): 3.367(1), 7.24(1), 3.068(0.8),

Physical Properties of Bannermanite

Cleavage:

{100} Perfect, {010} Fair

Color:

Black.

Density:

3.5

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Sub Metallic

Streak:

brownish black

Optical Properties of Bannermanite

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

Optical Data:

Biaxial (?), b=2.2

Calculated Properties of Bannermanite

Electron Density:

Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Bannermanite =3.54 gm/cc.

Fermion Index:

Fermion Index = 0.0015581015
Boson Index = 0.9984418985

Photoelectric:

PE_Bannermanite= 10.68 barns/electron
U=PE_Bannermanite x r_electron= 35.76 barns/cc.

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

Dana Class:

47.03.05.01 (47)Vanadium Oxysalts

(47.03)(Hydrated)

(47.03.05)Dana Group

47.03.05.01 Bannermanite (Na,K)0.7V6O15 C 2/m 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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
15 - WWW-MINCRYST

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

Bannermanite

(Na,K)0.7V+++++6O15
Dana No: 47.03.05.01 Strunz No: 04.HF.05
Locality:

Notes:

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