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Barnesite

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Formula:
(Na,Ca)V6O16 · 3H2O
System:
Monoclinic
Colour:
Brilliant dark red; ...
Hardness:
3
Member of:
Name:
Named in honor of William Howard Barnes (1903-1980), Canadian physicist and crystallographer, McGill University, Montreal (1924-1946), Head of X-ray Diffraction Section, Division of Physics, National Research Council of Canada, Ottawa (1947-1968), a major contributor to the knowledge of the crystal chemistry and crystal structures of vanadium minerals.
For obituary see http://journals.iucr.org/a/issues/1981/02/00/a19646/a19646.pdf
This page provides mineralogical data about Barnesite.

Classification of Barnesite

Approved
4.HG.45

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
G : Unclassified V oxides
47.3.1.3

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.1.3

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

Geological Setting of First Recorded Material:
In small cavities and fractures and as interstitial filling in sandstone in the oxidized zone of a vanadiferous uranium deposit
Associated Minerals at First Recorded Locality:

Physical Properties of Barnesite

Adamantine
Diaphaneity (Transparency):
Translucent
Colour:
Brilliant dark red; brownish red on exposure
Hardness (Mohs):
3
Tenacity:
Fragile
Cleavage:
Perfect
on {001}, fair on {100} and {010}
Density:
3.09 - 3.15 g/cm3 (Measured)    3.23 g/cm3 (Calculated)

Crystallography of Barnesite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Cell Parameters:
a = 12.17Å, b = 3.602Å, c = 7.78Å
β = 95.03°
Ratio:
a:b:c = 3.379 : 1 : 2.16
Unit Cell Volume:
V 339.73 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Subparallel to radiating aggregates of bladed to fibrous crystals, elongated along [010], to 0.5 mm; also as botryoidal to velvety coatings.
X-Ray Powder Diffraction Data:
d-spacingIntensity
12.2 (25)
7.90 (100)
3.45 (35)
3.12 (70)
2.92 (18)
2.27 (25)
1.800 (25)
Comments:
Recorded on type material

Optical Data of Barnesite

Type:
Biaxial (-)
RI values:
nα = 1.797 - 1.800 nβ = 2.010 - 2.040 nγ = 2.040 - 2.080
2V:
Measured: 60°
Max Birefringence:
δ = 0.243 - 0.280
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r << v
Pleochroism:
Strong
Comments:
X = yellow, Y = yellow-orange, Z = red; Orientation: Y = a, Z = b, X vs. c = 5°

Chemical Properties of Barnesite

Formula:
(Na,Ca)V6O16 · 3H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Analysis of material from Cactus Rat Mine, Utah, USA. Material from Kazakhstan has a distinct calcium content, and V4+ replacing V5+.
V2O5 (82.40)
SiO2 (0.40)
Na2O (9.10)
H2O (7.72)

sum 99.63 wt.-%
Common Impurities:
Ca

Relationship of Barnesite to other Species

Member of:
Other Members of Group:
Grantsite(Na,Ca)V6O16 · 4H2O
Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
HewettiteCaV6O16 · 9H2O
MetahewettiteCaV6O16 · 3H2O
4.HG.05FervaniteFe43+V45+O16 · 5H2O
4.HG.10HuemuliteNa4Mg(V10O28) · 24H2O
4.HG.15VanaliteNaAl8V10O38 · 30H2O
4.HG.20SimplotiteCaV44+O9 · 5H2O
4.HG.25VanoxiteV44+V25+O13 · 8H2O
4.HG.30NavajoiteFe3+V95+O24 · 12H2O
4.HG.35DelrioiteCaSr(V2O6)(OH)2 · 3H2O
4.HG.40MetadelrioiteCaSr(V2O6)(OH)2
4.HG.50Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
4.HG.55Grantsite(Na,Ca)V6O16 · 4H2O
4.HG.60LenobliteV24+O4 · 2H2O
4.HG.65SatpaeviteAl12V24+V65+O37 · 30H2O
21.1.1MetamuniriteNaVO3
21.1.2MuniriteNaVO3 · 1.9H2O
21.1.4Bannermanite(Na,K)0.7V4+0.7V5+5.3O15
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 Barnesite

Name in Other Languages:
German:Barnesit
Spanish:Barnesita

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 Barnesite

Reference List:
Weeks, A. D., Ross, D. R. and Marvin, R. F. (1963): The occurrence and properties of barnesite, Na2V6O16.3H2O, a new hydrated sodium vanadate mineral from Utah. American Mineralogist 48, 1187-1195.
Evans, H. T., Jr. and Hughes, J. M. (1990): Crystal chemistry of the natural vanadium bronzes. American Mineralogist 75, 508-521, esp. 514-515.
Akinovich, E. A. and Podlipaeva, N. I. (1986): A Ca-variety of barnesite from rocks of a carbonaceous-siliceous vanadium-bearing formation in southern Kazakhstan. Zap. Vses. Mineral. Obshch. 115, 345-351.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 43

Internet Links for Barnesite

Localities for Barnesite

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.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District slag localities
        • Agios Konstantinos [St Constantine] (Kamariza)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (II). Mineralien-Welt 25 (2), 82-95 (in German).
Italy
 
  • Liguria
    • Genova Province
      • Ne
        • Graveglia Valley
Bittarello, E., Armellino, G., Ambrino, P., Ciriotti, M.E. (2013): Barnesite: primo ritrovamento europeo. Micro, 11, 98-105.
Kazakhstan
 
  • Southern Kazakhstan Province (Ongtüstik Qazaqstan Oblysy; Yuzhno-Kazakhstanskaya Oblast')
    • Karatau Range
      • Aksumbe
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 43
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 43
USA
 
  • Colorado
    • Mesa Co.
      • Uravan District
Minerals of Colorado (1997) Eckels, E. B.
    • Montrose Co.
      • Uravan District
        • Bull Canyon
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
        • Paradox Valley
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
  • Nevada
    • Eureka Co.
      • Gibellini District
NBMG Spec. Pub. 31 Minerals of Nevada
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 43
  • New Mexico
    • Cibola Co.
      • Grants District
Northrup, Minerals of New Mexico, 3rd Rev. Ed., 1996
    • McKinley Co.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
  • Utah
    • Grand Co.
      • Yellow Cat District (W. part of Thompsons District)
        • Cisco
WEEKS, A.D., ROSS, D.R. & MARVIN, R.F. (1963): The occurrence and properties of barnesite, Na2V6O163H2O, a new hydrated sodium vanadate mineral from Utah. American Mineralogist 48, 1187-1195. EVANS, H.T. & HUGHES, J.M. (1990): Crystal chemistry of the natural vanadium bronzes. American Mineralogist 75, 508-521.
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal Creek Canyon
collection Leon Hupperichs
Mineral and/or Locality  
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