Bannermanite Mineral Data

Bannermanite Mineral Data +

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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.

Synonym:

ICSD 31208

PDF 35-713

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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 - PrismaticH-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),

Crystal Structure:

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Hughes J M , Finger L W , American Mineralogist , 68 (1983) p.634-641

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

Optical Data:

Biaxial (?), b=2.2

Calculated Properties of Bannermanite

Electron Density:

r_electron=3.35 gm/cc
note: r_Bannermanite=3.54 gm/cc.

Fermion Index

Fermion Index = 0.00155
Boson Index = 0.99845

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)

Estimated Radioactivity from Bannermanite - barely detectable

Bannermanite Classification

Dana Class:

47.3.5.1 (47)Vanadium Oxysalts

(47.3)(Hydrated)

(47.3.5)Dana Group

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

Strunz Class:

IV/G.13-10 IV - Oxides

IV/G - Vanadiumoxides (with V4+/5+), Network vanadates.

IV/G.13 - Bannermannite series

IV/G.13-10 Bannermanite (Na,K)0.7V6O15 C 2/m 2/m

IV/G.13-20 Phosphovanadylite! (Ba,Ca,K,Na)x[(V,Al)4P2(O,OH)16]·12(H2O)x~0.66 I 43m 4 3m

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Bannermanite

(Na,K)0.7V+++++6O15
Dana No: 47.3.5.1 Strunz No: IV/G.13-10
Locality:

Notes: