Corvusite Mineral Data

Corvusite Mineral Data

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General Corvusite Information

Chemical Formula:

(Na,Ca,K)V8O20·4(H2O)

Composition:

Molecular Weight = 829.26 gm

Potassium 0.71 % K 0.85 % K₂O

Sodium 1.66 % Na 2.24 % Na₂O

Calcium 1.21 % Ca 1.69 % CaO

Vanadium 49.14 % V 87.73 % V₂O₅

Hydrogen 0.97 % H 8.69 % H₂O

Oxygen 46.30 % O

______ ______

100.00 % 101.21 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Ca_0.25K_0.15V⁵⁺₈O₂₀·4(H₂O)

Environment:

Widely distributed in U-V deposits of the Colorado Plateau.

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Jack claim, Grand County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named from the Latin "corvus", raven, in allusion to the bird's color.

Synonym:

ICSD 64792

PDF 45-1363

Corvusite Image

Images:

Corvusite

Comments: Silky to dull brown corvusite in/on sandstone.
Location: Fire Fly Mine, near Delta, Emery County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Corvusite Vanoxite

Comments: Blue-black, somewhat silky vanoxite, with brown corvusite on sandstone.
Location: Club Mine, Uravan, Montrose County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Corvusite Crystallography

Axial Ratios:

a:b:c =3.2124:1:3.0461

Cell Dimensions:

a = 11.706, b = 3.644, c = 11.1, Z = 1; beta = 103.46° V = 460.48 Den(Calc)= 2.99

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): 10.81(1), 1.937(0.05), 3.59(0.05),

Physical Properties of Corvusite

Color:

Brown, Bluish black, Greenish black.

Density:

2.82

Diaphaniety:

Subtranslucent to Opaque

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Earthy (Dull)

Streak:

bluish black

Optical Properties of Corvusite

Optical Data:

NCalc= 2.01 - from Gladstone-Dale relationship (KC = 0.3373) where Ncalc=Dcalc*KC+1
NCalc= 1.95 - from Gladstone-Dale relationship (KC = 0.3373) where Ncalc=Dmeas*KC+1

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Corvusite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	10.30	20.70
420 nm	9.80	19.80
440 nm	9.30	18.90
460 nm	9.00	18.00
480 nm	8.70	17.30
500 nm	8.50	16.60
520 nm	8.40	16.00
540 nm	8.20	15.60
560 nm	8.20	15.10
580 nm	8.10	14.70
600 nm	8.00	14.30
620 nm	8.00	14.00
640 nm	8.00	13.70
660 nm	8.00	13.50
680 nm	8.00	13.40
700 nm	8.00	13.30

**Calculated Relative Intensity Colors of Corvusite in Air**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	1000%
R₁
R₂

Calculated Properties of Corvusite

Electron Density:

r_electron=2.87 gm/cc
note: r_Corvusite=2.99 gm/cc.

Fermion Index

Fermion Index = 0.00146
Boson Index = 0.99854

Photoelectric:

PE_Corvusite= 9.68 barns/electron
U=PE_Corvusite x r_electron= 27.81 barns/cc.

Radioactivity:

GRapi = 9.79 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Corvusite - barely detectable

Corvusite Classification

Dana Class:

47.3.2.2 (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.11-40 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 Corvusite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Corvusite :
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 Corvusite Specimen Label here :

Corvusite

(Na,Ca,K)V8O20·4(H2O)
Dana No: 47.3.2.2 Strunz No: IV/G.11-40
Locality:

Notes: