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Fernandinite

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Formula:
(Ca,K)(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
· 10H
 
2
O
System:MonoclinicColour:Dull green; light green, ...
Hardness:2 - 3
Member of:Straczekite Group
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

IMA status:Approved
Strunz 8th edition ID:4/G.11-35
Nickel-Strunz 10th (pending) edition ID:4.HE.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
Dana 8th edition ID:47.3.2.3

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
Hey's CIM Ref.:21.2.7

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

Type Locality:Ragra Mine (Minasragra), Huayllay District, Pasco Province, Pasco Department, Peru
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.
Year of Discovery:1994
Geological Setting of type material:A rich vanadium deposit in fissures that cut red shales
Associated Minerals at type locality:
QuartzHewettite

Physical Properties of Fernandinite

Lustre: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 (measured):2.78 g/cm3
Density (calculated):3.07 g/cm3

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:
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
Maximum Birefringence:δ = 0.000

Chart 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)(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
· 10H
 
2
O
Simplified for copy/paste:(Ca,K)(V5+,V4+,Fe2+)8O20·10H2O
Essential elements:Ca, H, O, V
All elements listed in formula:Ca, Fe, H, K, O, V

Relationship of Fernandinite to other Species

Member of:Straczekite Group
Other Members of Group:

- +
Bariandite
Al
 
0.6
(V
5+
 
,V
4+
 
)
 
8
O
 
20
· 9H
 
2
O
Bokite
(Al,Fe
3+
 
)
 
1.3
(V
5+
 
,V
4+
 
,Fe
3+
 
)
 
8
O
 
20
· 7.4H
 
2
O
Corvusite
(Na,K,Ca,Mg)
 
2
(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
· 6-10H
 
2
O
Straczekite
(Ca,K,Ba)(V
5+
 
,V
4+
 
)
 
8
O
 
20
· 3H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
4.HE.05Melanovanadite
Ca(V
5+
 
,V
4+
 
)
 
4
O
 
10
· 5H
 
2
O
4.HE.10Shcherbinaite
V
5+
2
O
 
5
4.HE.15Hewettite
CaV
 
6
O
 
16
· 9H
 
2
O
4.HE.15Metahewettite
CaV
 
6
O
 
16
· 3H
 
2
O
4.HE.20Bariandite
Al
 
0.6
(V
5+
 
,V
4+
 
)
 
8
O
 
20
· 9H
 
2
O
4.HE.20Bokite
(Al,Fe
3+
 
)
 
1.3
(V
5+
 
,V
4+
 
,Fe
3+
 
)
 
8
O
 
20
· 7.4H
 
2
O
4.HE.20Corvusite
(Na,K,Ca,Mg)
 
2
(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
· 6-10H
 
2
O
4.HE.20Straczekite
(Ca,K,Ba)(V
5+
 
,V
4+
 
)
 
8
O
 
20
· 3H
 
2
O
4.HE.25Häggite
V
3+
 
V
4+
 
O
 
2
(OH)
 
3
4.HE.30Doloresite
V
4+
3
O
 
4
(OH)
 
4
4.HE.35Duttonite
V
4+
 
O(OH)
 
2
4.HE.40Cavoite
CaV
4+
3
O
 
7
Related Minerals - Hey's Index Grouping:

- +
21.2.1Metarossite
Ca(V
 
2
O
 
6
) · 2H
 
2
O
21.2.2Rossite
Ca(V
 
2
O
 
6
) · 4H
 
2
O
21.2.3Metahewettite
CaV
 
6
O
 
16
· 3H
 
2
O
21.2.4Hewettite
CaV
 
6
O
 
16
· 9H
 
2
O
21.2.5Pintadoite
Ca
 
2
(V
 
2
O
 
7
) · 9H
 
2
O
21.2.6Hendersonite
(Ca,Sr)
 
1.3
V
 
6
O
 
16
· 6H
 
2
O
21.2.8Pascoite
Ca
 
3
(V
 
10
O
 
28
) · 17H
 
2
O
21.2.9Sherwoodite
Ca
 
4.5
(AlV
4+
2
V
5+
12
O
 
40
) · 28H
 
2
O
21.2.10Melanovanadite
Ca(V
5+
 
,V
4+
 
)
 
4
O
 
10
· 5H
 
2
O
21.2.11Grantsite
(Na,Ca)V
 
6
O
 
16
· 4H
 
2
O
21.2.12Hummerite
K
 
2
Mg
 
2
(V
 
10
O
 
28
) · 16H
 
2
O
21.2.13Metadelrioite
CaSr(V
 
2
O
 
6
)(OH)
 
2
21.2.14Delrioite
CaSr(V
 
2
O
 
6
)(OH)
 
2
· 3H
 
2
O
21.2.15Straczekite
(Ca,K,Ba)(V
5+
 
,V
4+
 
)
 
8
O
 
20
· 3H
 
2
O
21.2.16Gamagarite
Ba
 
2
Fe
3+
 
(VO
 
4
)
 
2
(OH)

Other Names for Fernandinite

Other Languages:
German:Fernandinit
Russian:Фернандинит
Spanish:Fernandinita

Other Information

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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Fernandinite details from Handbook of Mineralogy (PDF)
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  • Localities for Fernandinite

    The 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. ? 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
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