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Fernandinite

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Formula:
(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
System:
Monoclinic
Colour:
Dull green; light green, ...
Hardness:
2 - 3
Name:
Named in 1915 by Waldemar Theodore Schaller in honor of Eulagio E. Fernandini, who was formerly an owner of the Minasragra deposit.
Similar to corvusite.
Somewhat soluble in cold water, giving a yellow solution.

Classification of Fernandinite

Approved
4.HE.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
47.3.2.3

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.2.7

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

Place of Conservation of First Recorded Material:
Harvard University, Cambridge, Massachusetts, USA: #101718. U.S. National Museum of Natural History, Washington, D.C., USA: #87661, R5706.
Year of Discovery:
1994
Geological Setting of First Recorded Material:
A rich vanadium deposit in fissures that cut red shales
Associated Minerals at First Recorded Locality:

Physical Properties of Fernandinite

Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Dull green; light green, dark olive-green, brownish green in transmitted light
Streak:
Dark green
Hardness (Mohs):
2 - 3
Tenacity:
Waxy
Cleavage:
None Observed
Fracture:
Sub-Conchoidal, Micaceous
Density:
2.78 g/cm3 (Measured)    3.07 g/cm3 (Calculated)

Crystallography of Fernandinite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 11.680Å, b = 3.6537Å, c = 11.023Å
β = 105.00°
Ratio:
a:b:c = 3.197 : 1 : 3.017
Unit Cell Volume:
V 454.38 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Crystals rare, platy and rectangular. Fibrous, cryptocrystalline, porous masses.
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.68 (100)
5.65 (10)
3.545 (4)
3.483 (26)
2.826 (7)
2.549 (4)
1.949 (6)
1.836 (8)
Comments:
Very similar to the data for corvusite.

Optical Data of Fernandinite

Type:
Biaxial
RI values:
n = 2.05
Birefringence:
Strong
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Comments:
2V measured value not determined.

Chemical Properties of Fernandinite

Formula:
(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
Essential elements:
All elements listed in formula:

Relationship of Fernandinite to other Species

Other Members of Group:
BarianditeAl0.6(V5+,V4+)8O20 · 9H2O
Bokite(Al,Fe3+)1.3(V5+,V4+,Fe3+)8O20 · 7.4H2O
Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O
Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2O
4.HE.05MelanovanaditeCa(V5+,V4+)4O10 · 5H2O
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.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
21.2.8PascoiteCa3(V10O28) · 17H2O
21.2.9SherwooditeCa4.5(AlV24+V125+O40) · 28H2O
21.2.10MelanovanaditeCa(V5+,V4+)4O10 · 5H2O
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 Fernandinite

Name in Other Languages:

Other Information

Not fluorescent in UV
Other Information:
Readily soluble in acids to a green solution. Somewhat soluble in cold H2O, yielding a yellow solution.
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 Fernandinite

Reference List:
Schaller (1915) Journal of the Washington Academy of Science: 5: 7.

Dana, E.S. (1915) System of Mineralogy, 6th. Edition, New York. App. 3, by W.E. Ford: 29 (Schaller in).

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 74.

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.: 1062.

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

Evans, H.T., Jr., J.E. Post, D.R. Ross, and J.A. Nelen (1994) The crystal structure and crystal chemistry of fernandinite and corvusite. Canadian Mineralogist: 32: 339-351.

American Mineralogist (1995): 80: 407.

Internet Links for Fernandinite

Localities for Fernandinite

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.
Peru
 
  • Pasco Department
    • Pasco Province
      • Huayllay District
Schaller (1915) Journal of the Washington Academy of Science: 5: 7; 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: 1062.
USA
 
  • Arizona
    • Apache Co.
      • Navajo Indian Reservation
        • Monument Valley
          • Monument No. 2 channel
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 220; Witkind, I.J. & R.E. Thaden (1963), Geology and uranium-vanadium deposits of the Monument Valley area, Apache and Navajo Cos., AZ: 115; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 79.
  • Colorado
    • Montrose Co.
      • Uravan District
Minerals of Colorado (1997) Eckels, E. B.
    • San Miguel Co.
      • Slick Rock District
Min News (1987) 3:9 p 5-6
      • Uravan District
        • Carnation Mine group
Excalibur Mineral Co. sample and analysis
  • Utah
    • Emery Co.
      • San Rafael District (San Rafael Swell)
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • Grand Co.
      • Yellow Cat District (W. part of Thompsons District)
        • Cisco
Van King
Mineral and/or Locality  
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