Melanovanadite Mineral Data

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General Melanovanadite Information

Chemical Formula:

CaV++++2V+++++2O10•5(H2O)

Composition:

Molecular Weight = 493.91 gm

Calcium 8.11 % Ca 11.35 % CaO

Vanadium 41.26 % V 73.65 % V₂O₅

Hydrogen 2.04 % H 18.24 % H₂O

Oxygen 48.59 % O

______ ______

100.00 % 103.24 % = TOTAL OXIDE

Empirical Formula:

CaV⁵⁺₂V⁵⁺₂O₁₀•5(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1921

Locality:

Mina Ragra (Minasragra), Junín, Cerro de Pasco, Pasco dept., Peru. Link to MinDat.org Location Data.

Name Origin:

From the Greek, Melano, "dark" and the composition.

Name Pronunciation:

Melanovanadite + Pronunciation

Synonym:

ICSD 202257

PDF 39-321

Melanovanadite Image

Images:

Melanovanadite

Comments: Dark greenish-black fine-grained massive melanovanadite.
Location: Minas Ragra, near Cerro de Pasco, Junin, Peru. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Melanovanadite Crystallography

Axial Ratios:

a:b:c =0.3515:1:0.3469

Cell Dimensions:

a = 6.36, b = 18.09, c = 6.276, Z = 2; alpha = 110.18°, beta = 101.62°, gamma = 82.86° V = 658.71 Den(Calc)= 2.49

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

Forms:

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Forms: ( 1 2 1) ( 1 0 1) ( 0 1 0) ( 1 1 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Konnert J A , Evans H T , American Mineralogist , 72 (1987) p.637-644, Crystal structure and crystal chemistry of melanovanadite, a natural vanadium, bronze

Physical Properties of Melanovanadite

Cleavage:

{010} Perfect

Color:

Black.

Density:

2.55

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

2.5 - Finger Nail

Luster:

Sub Metallic

Streak:

dark red brown

Optical Properties of Melanovanadite

Gladstone-Dale:

CI meas= -0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3589,KPDmeas= 0.349,KC= 0.3363
Ncalc = 1.83 - 1.86

Optical Data:

Biaxial (-), a=1.73, b=1.96, g=1.98, bire=0.2500

Calculated Properties of Melanovanadite

Electron Density:

Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Melanovanadite =2.55 gm/cc.

Fermion Index:

Fermion Index = 0.0013772182
Boson Index = 0.9986227818

Photoelectric:

PE_{Melanovanadite}= 8.81 barns/electron
U=PE_{Melanovanadite} x rElectron Density= 22.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Melanovanadite is Not Radioactive

Melanovanadite Classification

Dana Class:

47.03.06.01 (47)Vanadium Oxysalts

(47.03)(Hydrated)

(47.03.06)Dana Group

47.03.06.01 Melanovanadite CaV2V2O10•5(H2O) P1 1

Strunz Class:

04.HE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.H - V[5,6] Vanadates

04.HE -Phyllovanadates

04.HE.05 Melanovanadite CaV2V2O10•5(H2O) P1 1

Other Melanovanadite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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

Melanovanadite

CaV++++2V+++++2O10•5(H2O)
Dana No: 47.03.06.01 Strunz No: 04.HE.05
Locality:

Notes: