Fernandinite Mineral Data

Fernandinite Mineral Data +

General Fernandinite Information

Chemical Formula:

CaV8O20·4(H2O)

Composition:

Molecular Weight = 839.66 gm

Calcium 4.77 % Ca 6.68 % CaO

Vanadium 48.54 % V 86.64 % V₂O₅

Hydrogen 0.96 % H 8.58 % H₂O

Oxygen 45.73 % O

______ ______

100.00 % 101.91 % = TOTAL OXIDE

Empirical Formula:

CaV⁵⁺₈O₂₀·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1915

Locality:

Minasragra, Peru. Link to MinDat.org Location Data.

Name Origin:

Named for Eulagio E. Fernanadini, former owner of the Minasragra deposit.

Synonym:

ICSD 79139

PDF 45-1362

Fernandinite Image

Images:

Fernandinite

Comments: Greenish-yellow fernandinite coatings on sandstone.
Location: Deremo-Snyder Mine, Egnar, San Miguel County, Colorado. USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fernandinite Crystallography

Axial Ratios:

a:b:c =3.1964:1:3.0166

Cell Dimensions:

a = 11.68, b = 3.654, c = 11.023, Z = 1; beta = 105° V = 454.42 Den(Calc)= 3.07

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.68(1), 1.84(0.8), 3.48(0.3),1.95(0.1), 2.55(0.1), 2.83(0.1), 3.55(0.1), 5.65(0.1),

Crystal Structure:

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Evans H T , Post J E , Ross D R , Nelen J A , The Canadian Mineralogist , 32 (1994) p.339-351, The crystal structure and crystal chemistry of fernandinite and corvusite, Minasragu, Peru, with general formula (Ca,Na,K)x(V,Fe,Ti)8O20.4H2O, Locality: Minasragu, Peru

Physical Properties of Fernandinite

Cleavage:

[???] Perfect

Color:

Dark green.

Density:

2.78

Habit:

Foliated - Two dimensional platy forms.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Sub Metallic

Streak:

dark green

Optical Properties of Fernandinite

Optical Data:

NCalc= 2.04 - from Gladstone-Dale relationship (KC = 0.3378) where Ncalc=Dcalc*KC+1
NCalc= 1.94 - from Gladstone-Dale relationship (KC = 0.3378) where Ncalc=Dmeas*KC+1

Calculated Properties of Fernandinite

Electron Density:

r_electron=2.95 gm/cc
note: r_Fernandinite=3.07 gm/cc.

Fermion Index

Fermion Index = 0.00149
Boson Index = 0.99851

Photoelectric:

PE_Fernandinite= 9.90 barns/electron
U=PE_Fernandinite x r_electron= 29.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fernandinite is Not Radioactive

Fernandinite Classification

Dana Class:

47.3.2.3 (47)Vanadium Oxysalts

(47.3)(Hydrated)

(47.3.2)Dana Group

47.3.2.1 Straczekite (Ca,K,Ba)2V8O20·3(H2O) C 2/m 2/m

47.3.2.2 Corvusite (Na,Ca,K)V8O20·4(H2O) C 2/m 2/m

47.3.2.3 Fernandinite CaV8O20·4(H2O) C 2/m 2/m

47.3.2.4 Bariandite Al0.6V8O20·9(H2O) C 2/c 2/m

47.3.2.5 Bokite (Al,Fe)1.3(V,Fe)8O20·4.7(H2O) C 2/m 2/m

47.3.2.6 Kazakhstanite Fe5V3V12O39·8.5(H2O) C 2/m 2/m

Strunz Class:

IV/G.11-35 IV - Oxides

IV/G - Vanadiumoxides (with V4+/5+) Layered vanadates. Typical Vanadiumbronzes

IV/G.11 - Bariandite - Corvusite-? series

IV/G.11-10 Bariandite Al0.6V8O20·9(H2O) C 2/c 2/m

IV/G.11-20 Bokite (Al,Fe)1.3(V,Fe)8O20·4.7(H2O) C 2/m 2/m

IV/G.11-30 Straczekite (Ca,K,Ba)2V8O20·3(H2O) C 2/m 2/m

IV/G.11-35 Fernandinite CaV8O20·4(H2O) C 2/m 2/m

IV/G.11-40 Corvusite (Na,Ca,K)V8O20·4(H2O) C 2/m 2/m

Other Fernandinite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Fernandinite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Fernandinite Specimen Label here :

Fernandinite

CaV8O20·4(H2O)
Dana No: 47.3.2.3 Strunz No: IV/G.11-35
Locality:

Notes: