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Bannermanite

Formula:
(Na,K)
 
0.7
V
4+
0.7
V
5+
5.3
O
 
15
System:MonoclinicColour: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.
This page provides mineralogical data about Bannermanite.

Classification of Bannermanite

IMA status:Approved
Strunz 8th edition ID:4/G.13-10
Nickel-Strunz 10th (pending) edition ID:4.HF.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
F : Tektovanadates
Dana 8th edition ID:47.3.5.1

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
Hey's CIM Ref.:21.1.4

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

Type Locality:Izalco Volcano, Sonsonate Department, El Salvador
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)
Year of Discovery:1983
Geological Setting of type material:Vanadium-bearing sublimates in fumaroles on a basaltic volcanic cone
Associated Minerals at type locality:
ZiesiteStoiberiteShcherbinaiteFingeriteChalcocyanite
Chalcanthite

Physical Properties of Bannermanite

Lustre: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 (measured):3.5 g/cm3
Density (calculated):3.55 g/cm3

Crystallography of Bannermanite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Cell Parameters:a = 15.413Å, b = 3.615Å, c = 10.066Å
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:
d-spacingIntensity
7.24 (100)
3.367 (100)
3.068 (80)
2.911 (80)
9.47 (70)
3.491 (70)
Comments:Recorded on material from Izalco volcano, El Salvador (ICDD 35-713)

Optical Data of Bannermanite

Type:Biaxial
Dispersion:relatively strong

Chemical Properties of Bannermanite

Formula:
(Na,K)
 
0.7
V
4+
0.7
V
5+
5.3
O
 
15
Essential elements:Na, O, V
All elements listed in formula:K, Na, O, V
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.-%
Empirical Formula:
(Na
 
0.56
K
 
0.15
)
 
=0.71
V
4+
0.71
V
5+
5.29
O
 
15

Relationship of Bannermanite to other Species

Related Minerals - Hey's Index Grouping:

- +
21.1.1Metamunirite
NaVO
 
3
21.1.2Munirite
NaVO
 
3
·2H
 
2
O
21.1.3Barnesite
Na
 
2
[V
 
2
O
 
6
|V
 
4
O
 
10
] · 3H
 
2
O
21.1.5Howardevansite
NaCuFe
 
2
(VO
 
4
)
 
3
21.1.6Huemulite
Na
 
4
Mg[V
 
10
O
 
28
] · 24H
 
2
O
21.1.7Blossite
α-Cu
 
2
[V
 
2
O
 
7
]
21.1.8Ziesite
β-Cu
 
2
[V
 
2
O
 
7
]
21.1.9Stoiberite
Cu
 
5
[O
 
2
|(VO
 
4
)
 
2
]
21.1.10Mcbirneyite
Cu
 
3
(VO
 
4
)
 
2
21.1.11Fingerite
Cu
 
11
[O
 
2
|(VO
 
4
)
 
6
]
21.1.12Volborthite
Cu
 
3
[(OH)
 
2
|V
 
2
O
 
7
] · 2H
 
2
O
21.1.13Tangeite
CaCu[OH|VO
 
4
]
21.1.14Vésigniéite
BaCu
 
3
[OH|VO
 
4
]
 
2
21.1.15Lyonsite
Cu
 
3
Fe
 
4
(VO
 
4
)
 
6

Other Names for Bannermanite

Synonyms:
Bannermanite (of Hughes et al.)IMA1980-010
Other Languages:
German:Bannermanit
Russian:Баннерманит
Spanish:Bannermanita

Other Information

Health Warning: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 vanadata 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

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    Localities for Bannermanite

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