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Bannermanite

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Formula:
(Na,K)0.7V4+0.7V5+5.3O15
System:
Monoclinic
Colour:
Black, light brown on ...
Lustre:
Sub-Metallic
Name:
For Dr. Harold MacColl Bannerman (1897-1976), American economic geologist, U.S. Geological Survey and Dartmouth College, Hanover, New Hampshire, USA.
Visually similar to Unnamed (Na-V Oxide) (which is more common at the Liebenbergite slag locality in Lavrion).




Classification of Bannermanite

Approved
4.HF.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
F : Tektovanadates
47.3.5.1

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.1.4

21 : Vanadates (and vanadates with arsenate or phosphate)
1 : Vanadates of the alkalis and Cu

Physical Properties of Bannermanite

Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Black, light brown on thin edges in transmitted light
Streak:
Dark grey-black
Tenacity:
Brittle
Cleavage:
Perfect
on {100}, fair on {010}
Density:
3.5 g/cm3 (Measured)    3.55 g/cm3 (Calculated)

Optical Data of Bannermanite

Type:
Biaxial
Dispersion:
relatively strong

Chemical Properties of Bannermanite

Formula:
(Na,K)0.7V4+0.7V5+5.3O15
IMA Formula:
(Na,K)xVx4+V5+6-xO15 (0.5< x<0.9)
Elements listed in formula:
Analytical Data:
Averages of six electron microprobe analyses of type material; V4+:V5+ ratio calculated from the charge balance
V2O5 (95.98)
Na2O (3.03)
K2O (1.26)

sum 100.27 wt.-%

Crystallography of Bannermanite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 15.413 Å, b = 3.615 Å, c = 10.066 Å
β = 109.29°
Ratio:
a:b:c = 4.264 : 1 : 2.785
Unit Cell Volume:
V 529.37 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Subhedral to euhedral lathlike crystals, flattened on {001} and elongated along [010].
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.24 (100)
3.367 (100)
3.068 (80)
2.911 (80)
9.47 (70)
3.491 (70)
2.725 (60)
Comments:
Recorded on material from Izalco volcano, El Salvador (ICDD 35-713)

Type Occurrence of Bannermanite

General Appearance of Type Material:
Incrustations of subhedral to euhedral lathlike crystals of up to 250 µm
Place of Conservation of Type Material:
Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire, USA;
Harvard University, Cambridge, Massachusetts, USA (No. 126482);
National Museum of Natural History, Washington, D.C., USA (Nos. 148832, 160385)
Geological Setting of Type Material:
Vanadium-bearing sublimates in fumaroles on a basaltic volcanic cone
Empirical Formula:
(Na0.56K0.15)=0.71V4+0.71V5+5.29O15

Relationship of Bannermanite to other Species

21.1.1MetamuniriteNaVO3
21.1.2MuniriteNaVO3 · 1.9H2O
21.1.3Barnesite(Na,Ca)V6O16 · 3H2O
21.1.5HowardevansiteNaCuFe2(VO4)3
21.1.6HuemuliteNa4Mg(V10O28) · 24H2O
21.1.7Blossiteα-Cu2(V2O7)
21.1.8Ziesiteβ-Cu2(V2O7)
21.1.9StoiberiteCu5(VO4)2O2
21.1.10McbirneyiteCu3(VO4)2
21.1.11FingeriteCu11(VO4)6O2
21.1.12VolborthiteCu3(V2O7)(OH)2 · 2H2O
21.1.13TangeiteCaCu(VO4)(OH)
21.1.14VésigniéiteBaCu3(VO4)2(OH)2
21.1.15LyonsiteCu3Fe4(VO4)6

Other Names for Bannermanite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bannermanite

Reference List:
Hughes, J. M. and Finger, L. W. (1983): Bannermanite, a new sodium-potassium vanadate isostructural with β-NaxV6O15. American Mineralogist 68, 634-642.

Evans, H. T., Jr. and Hughes, J. M. (1990): Crystal chemistry of the natural vanadium bronzes. American Mineralogist 75, 508-521. [esp. 511-512, 519]

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 36.

Internet Links for Bannermanite

mindat.org URL:
https://www.mindat.org/min-508.html
Please feel free to link to this page.

Localities for Bannermanite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Liberec Region
Scharm, B.: Přehled minerálů nalezených v oblasti uranových koncentrací v severočeské křídě. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 169-172.
El Salvador (TL)
 
  • Sonsonate Department
Amer.Min.(1983) 68, 634-641
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District slag localities
        • Agios Konstantinos [St Constantine] (Kamariza)
Igor Pekov analysis (IR, SXRD, EPMA); Koshlyakova, N.N., Zubkova, N.V., Pekov, I.V., Giester, G., Pushcharovsky, D.Yu., Chukanov, N.V., Voudouris, P., Magganas, A., Katerinopoulos, A. (2016): Crystal chemistry of a Ni-Mg-analogue of lyonsite from slags of Lavrion, Greece. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry 193, 113-120.
Russia
 
  • Far-Eastern Region
    • Kamchatka Oblast'
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Kartashov, P.M., Polekhovsky, Yu.S., Murashko, M.N., Pushcharovsky, D.Y. (2014): Koksharovite, CaMg2Fe3+4(VO4)6, and grigorievite, Cu3Fe3+2Al2(VO4)6, two new howardevansite-group minerals from volcanic exhalations. European Journal of Mineralogy, 26, 667-677.
Mineral and/or Locality  
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