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Fernandinite

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Formula:
(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
Colour:
Dull green; light green, dark olive-green, brownish green in transmitted light
Lustre:
Sub-Metallic
Hardness:
2 - 3
Specific Gravity:
2.78
Crystal System:
Monoclinic
Name:
Named in 1915 by Waldemar Theodore Schaller in honor of Eulagio E. Fernandini (13 September 1860; 24 December 1947), who was formerly an owner of the Minasragra deposit.
Similar to corvusite.
Somewhat soluble in cold water, giving a yellow solution.


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Classification of FernandiniteHide

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of FernandiniteHide

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

Optical Data of FernandiniteHide

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 FernandiniteHide

Formula:
(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
IMA Formula:
(Ca,Na,K)0.9(V5+,V4+,Fe2+,Ti)8O20 · 4H2O

Crystallography of FernandiniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 11.680 Å, b = 3.6537 Å, c = 11.023 Å
β = 105.00°
Ratio:
a:b:c = 3.197 : 1 : 3.017
Unit Cell V:
454.38 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Crystals rare, platy and rectangular. Fibrous, cryptocrystalline, porous masses.

X-Ray Powder DiffractionHide

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.

Type Occurrence of FernandiniteHide

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

Other Language Names for FernandiniteHide

Relationship of Fernandinite to other SpeciesHide

Other Members of this group:
BarianditeAl0.6(V5+,V4+)8O20 · 9H2OMon.
Bokite(Al,Fe3+)1.3(V5+,V4+,Fe3+)8O20 · 7.4H2OMon.
Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2OMon.
Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pintadoite4 photos of Fernandinite associated with Pintadoite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.HE.05MelanovanaditeCa(V5+,V4+)4O10 · 5H2OTric. 1 : P1
4.HE.10ShcherbinaiteV5+2O5Orth. mmm (2/m 2/m 2/m) : Pmmn
4.HE.15HewettiteCaV6O16 · 9H2OMon. 2/m : P21/m
4.HE.15MetahewettiteCaV6O16 · 3H2OMon. 2/m
4.HE.20BarianditeAl0.6(V5+,V4+)8O20 · 9H2OMon.
4.HE.20Bokite(Al,Fe3+)1.3(V5+,V4+,Fe3+)8O20 · 7.4H2OMon.
4.HE.20Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2OMon.
4.HE.20Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon.
4.HE.25HäggiteV3+V4+O2(OH)3Mon.
4.HE.30DoloresiteV4+3O4(OH)4Mon.
4.HE.35DuttoniteV4+O(OH)2Mon. 2/m
4.HE.40CavoiteCaV4+3O7Orth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Dana Grouping (8th Ed.)Hide

47.3.2.1Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon.
47.3.2.2Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2OMon.
47.3.2.4BarianditeAl0.6(V5+,V4+)8O20 · 9H2OMon.
47.3.2.5Bokite(Al,Fe3+)1.3(V5+,V4+,Fe3+)8O20 · 7.4H2OMon.
47.3.2.6KazakhstaniteFe3+5V4+3V5+12O39(OH)9 · 9H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

21.2.1MetarossiteCa(V2O6) · 2H2OTric. 1 : P1
21.2.2RossiteCa(VO3)2•4H2OTric. 1 : P1
21.2.3MetahewettiteCaV6O16 · 3H2OMon. 2/m
21.2.4HewettiteCaV6O16 · 9H2OMon. 2/m : P21/m
21.2.5PintadoiteCa2(V2O7) · 9H2O
21.2.6Hendersonite(Ca,Sr)1.3V6O16 · 6H2OOrth.
21.2.8PascoiteCa3(V10O28) · 17H2OMon. 2 : B2
21.2.9SherwooditeCa4.5(AlV4+2V5+12O40) · 28H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
21.2.10MelanovanaditeCa(V5+,V4+)4O10 · 5H2OTric. 1 : P1
21.2.11Grantsite(Na,Ca)2+x(V5+,V4+)6O16 · 4H2OMon.
21.2.12HummeriteK2Mg2(V10O28) · 16H2OTric.
21.2.13MetadelrioiteCaSr(V2O6)(OH)2Tric.
21.2.14DelrioiteCaSr(V2O6)(OH)2 · 3H2OMon.
21.2.15Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon.
21.2.16GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m

Fluorescence of FernandiniteHide

Not fluorescent in UV

Other InformationHide

Notes:
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 FernandiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 FernandiniteHide

Localities for FernandiniteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Peru (TL)
 
  • 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
          • Yazzi Mesa
            • 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.
      • Thompsons District (S. E. Thomsons)
        • The Poison Strip
Van King
Mineral and/or Locality  
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