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Melanovanadite

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Formula:
Ca(V5+,V4+)4O10 · 5H2O
System:
Triclinic
Colour:
Black; dark reddish ...
Hardness:
Name:
From the Greek for "black," in allusion to its colour, and in allusion to its composition, containing VANADium.
A secondary mineral occurring in Colorado Plateau-type U-V deposits and in altered black shale in a very rich vanadium deposit (TL). Contains interlayer H2O which is easily displaced.

Classification of Melanovanadite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.HE.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
47.3.6.1

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.2.10

21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba
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First Recorded Occurrence of Melanovanadite

Place of Conservation of First Recorded Material:
Harvard University, Cambridge, Massachusetts, USA: #90452. American Museum of Natural History, New York, New York, USA: #19310. U.S. National Museum of Natural History, Washington, D.C., USA: #138067, 160076.
Year of Discovery:
1921
Geological Setting of First Recorded Material:
Altered black shale in a very rich vanadium deposit
Associated Minerals at First Recorded Locality:

Occurrences of Melanovanadite

Geological Setting:
Colorado Plateau-type U-V deposits in Shinarump sandstone.

Physical Properties of Melanovanadite

Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Black; dark reddish brown in transmitted light
Streak:
Dark reddish brown
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
On {010}, perfect.
Density:
2.55 g/cm3 (Measured)    2.53 g/cm3 (Calculated)

Crystallography of Melanovanadite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.36Å, b = 18.09Å, c = 6.276Å
α = 110.18°, β = 101.62°, γ = 82.86°
Ratio:
a:b:c = 0.352 : 1 : 0.347
Z:
2
Morphology:
Crystals prismatic, striated and elongated [001], with prominent but rounded prism zone and complexly terminated; radiating aggregates and rosettes; velvety.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Melanovanadite

Type:
Biaxial (-)
RI values:
nα = 1.730 nβ = 1.960 nγ = 1.980
Max Birefringence:
δ = 0.250
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively strong
Pleochroism:
Visible
Comments:
X = Light reddish brown
Y ^ c 15° = Deep reddish brown
Z = b = Dark reddish brown
Comments:
2V = medium.

Chemical Properties of Melanovanadite

Formula:
Ca(V5+,V4+)4O10 · 5H2O
Essential elements:
All elements listed in formula:

Relationship of Melanovanadite to other Species

Common Associates:
4.HE.10ShcherbinaiteV25+O5
4.HE.15HewettiteCaV6O16 · 9H2O
4.HE.15MetahewettiteCaV6O16 · 3H2O
4.HE.20BarianditeAl0.6(V5+,V4+)8O20 · 9H2O
4.HE.20Bokite(Al,Fe3+)1.3(V5+,V4+,Fe3+)8O20 · 7.4H2O
4.HE.20Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O
4.HE.20Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
4.HE.20Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2O
4.HE.25HäggiteV3+V4+O2(OH)3
4.HE.30DoloresiteV34+O4(OH)4
4.HE.35DuttoniteV4+O(OH)2
4.HE.40CavoiteCaV34+O7
21.2.1MetarossiteCa(V2O6) · 2H2O
21.2.2RossiteCa(V2O6) · 4H2O
21.2.3MetahewettiteCaV6O16 · 3H2O
21.2.4HewettiteCaV6O16 · 9H2O
21.2.5PintadoiteCa2(V2O7) · 9H2O
21.2.6Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
21.2.7Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
21.2.8PascoiteCa3(V10O28) · 17H2O
21.2.9SherwooditeCa4.5(AlV24+V125+O40) · 28H2O
21.2.11Grantsite(Na,Ca)V6O16 · 4H2O
21.2.12HummeriteK2Mg2(V10O28) · 16H2O
21.2.13MetadelrioiteCaSr(V2O6)(OH)2
21.2.14DelrioiteCaSr(V2O6)(OH)2 · 3H2O
21.2.15Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2O
21.2.16GamagariteBa2Fe3+(VO4)2(OH)

Other Names for Melanovanadite

Name in Other Languages:

Other Information

Other Information:
Readily soluble in acids.
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 Melanovanadite

Reference List:
Lindgren (1921) Proceedings of the National Academy of Science: 7: 249.

Lindgen, W., Hamilton, and Palache (1922) American Journal of Science: 3: 195.

American Mineralogist (1922): 7: 163.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 206.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1059-1060.

Bayliss, P. and J.M. Hughes (1985) X-ray diffraction data for melanovanadite. American Mineralogist: 70: 644–645.

Konnert, J.A. and H.T. Evans, Jr. (1987) Crystal structure and crystal chemistry of melanovanadite, a natural vanadium bronze. American Mineralogist: 72: 637-644.

Evans, H.T., Jr. and J.M. Hughes (1990) Crystal chemistry of the natural vanadium bronzes. American Mineralogist: 75: 508–521.

Internet Links for Melanovanadite

Localities for Melanovanadite

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)
    • Pardubice Region
Sejkora J., Škácha P., Venclík V., Plášil J. (2013): Vanad-uranová mineralizace v lomu Prachovice (Česká republika) [anadium-uranium mineralization in the Prachovice quarry (Czech Republic)]. Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 21, 113-130.
Gabon
 
  • Haut-Ogooué Province
    • Franceville
J. Geffroy, J.A. Sarcia, J. Chervet : "Les Minéraux Uranifères Français", 1960, Institut National des Sciences et Techniques Nucléaires / Saclay - PUF.
Peru
 
  • Pasco Department
    • Pasco Province
      • Huayllay District
Proceedings of the National Academy of Science (1921): 7(8): 249-251; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1060.
USA
 
  • Arizona
    • Apache Co.
      • Lukachukai Mts
Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp1243-267
Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 78.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 292; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 78.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 292; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 78.
  • Colorado
    • Garfield Co.
      • East Rifle Creek area
Minerals of Colorado (1997) Eckels, E. B.
    • Montrose Co.
      • Uravan District
        • Bull Canyon
USGS Prof Paper 320
        • Paradox Valley
Minerals of Colorado (1997) Eckels, E. B.
USGS Prof Paper 320
Minerals of Colorado (1997) E.B. Eckels
  • Utah
    • Grand Co.
      • Polar Mesa District (Polar Mesa)
Collected by and in the collection of Brent Thorne.
      • Thompsons District (S. E. Thomsons)
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Wilson Mesa
Handbook of Mineralogy
      • Yellow Cat District (W. part of Thompsons District)
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014): Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine, 78, 497-505.
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal Creek Canyon
UGMS Bull 117 Minerals and Mineral Localities of Utah
        • Lyon Canyon Creek
UGMS Bull 117 Minerals and Mineral Localities of Utah
Mineral and/or Locality  
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