Magnesiocoulsonite Mineral Data

Magnesiocoulsonite Mineral Data

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General Magnesiocoulsonite Information

Chemical Formula:

MgV+++2O4

Composition:

Molecular Weight = 190.19 gm

Magnesium 12.78 % Mg 21.19 % MgO

Vanadium 53.57 % V 78.81 % V₂O₃

Oxygen 33.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgV³⁺₂O₄

Environment:

An accessory mineral in Cr-V bearing parametamorphic rocks.

IMA Status:

Approved IMA 1995

Locality:

Precambrian Slyudyanka Complex, Slyudyanka, southern Lake Baikal Region, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its relationship to coulsonite.

Synonym:

ICSD 60412

IMA1994-034

PDF 77-2130

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Magnesiocoulsonite Crystallography

Cell Dimensions:

a = 8.385, Z = 8; V = 589.53 Den(Calc)= 4.29

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 2.52(1), 1.582(0.9), 4.84(0.9),

Crystal Structure:

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Rudorff W , Reuter B , Zeitschrift fur Anorganische und Allgemeine Chemie , 253 (1947) p.194-208, Die struktur der magnesium- und zink-vanadinspinelle, Locality: synthetic

Physical Properties of Magnesiocoulsonite

Cleavage:

None

Color:

Black.

Density:

4.3

Diaphaniety:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Metallic

Streak:

black

Optical Properties of Magnesiocoulsonite

Optical Data:

Isotropic.

NCalc= 2.13 - from Gladstone-Dale relationship (KC = 0.2623) where Ncalc=Dcalc*KC+1
NCalc= 2.13 - from Gladstone-Dale relationship (KC = 0.2623) where Ncalc=Dmeas*KC+1

RL Color:

Light gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Magnesiocoulsonite in Air**
λ	R	∑ R(λ)
400 nm	14.30
420 nm	14.20
440 nm	14.10
460 nm	14.00
480 nm	13.90
500 nm	13.80
520 nm	13.80
540 nm	13.70
560 nm	13.70
580 nm	13.70
600 nm	13.70
620 nm	13.70
640 nm	13.70
660 nm	13.80
680 nm	13.80
700 nm	13.70

**Calculated Relative Intensity Colors of Magnesiocoulsonite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	640%
R

Calculated Properties of Magnesiocoulsonite

Electron Density:

r_electron=4.06 gm/cc
note: r_{Magnesiocoulsonite}=4.29 gm/cc.

Fermion Index

Fermion Index = 0.01428
Boson Index = 0.98572

Photoelectric:

PE_{Magnesiocoulsonite}= 10.62 barns/electron
U=PE_{Magnesiocoulsonite} x r_electron= 43.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiocoulsonite is Not Radioactive

Magnesiocoulsonite Classification

Dana Class:

7.2.4.3 (7)Multiple Oxides

(7.2)(A+ B++)2 X4 Spinel group

(7.2.4)(Vanadium subgroup)

7.2.4.1 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m

7.2.4.2 Coulsonite FeV2O4 F d3m 4/m 3 2/m

7.2.4.3 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m

Strunz Class:

IV/B.04-05 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related), V/Ti/Ge-Spinels

IV/B.04 - Spinel group, Vuorelainenite - Brunogeierite series

IV/B.04-05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m

IV/B.04-10 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m

IV/B.04-20 Coulsonite FeV2O4 F d3m 4/m 3 2/m

IV/B.04-30 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m

IV/B.04-40 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m

IV/B.04-50 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m

Other Magnesiocoulsonite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1283,1996) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Magnesiocoulsonite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Magnesiocoulsonite

MgV+++2O4
Dana No: 7.2.4.3 Strunz No: IV/B.04-05
Locality:

Notes: