Melkovite Mineral Data

General Melkovite Information

Chemical Formula:

CaFe+++H6(MoO4)4(PO4)•6(H2O)

Composition:

Molecular Weight = 938.74 gm

Calcium 4.27 % Ca 5.97 % CaO

Iron 5.95 % Fe 8.51 % Fe₂O₃

Molybdenum 40.88 % Mo 61.33 % MoO₃

Phosphorus 3.30 % P 7.56 % P₂O₅

Hydrogen 1.29 % H 11.51 % H₂O

Oxygen 44.31 % O

______ ______

100.00 % 94.89 % = TOTAL OXIDE

Empirical Formula:

CaFe³⁺(MoO₄)₄(PO₄)•6(H₂O)

Environment:

Molybdenite-fluorite deposit.

IMA Status:

Approved IMA 1969

Locality:

Shunak Mountains, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for Vyacheslav Gavrilovich Melkov (1911-1991), Russian mineralogist.

Name Pronunciation:

Melkovite + Pronunciation

Melkovite Crystallography

Axial Ratios:

a:b:c =0.9448:1:0.5914

Cell Dimensions:

a = 17.46, b = 18.48, c = 10.93, Z = 7; beta = 94.5° V = 3,515.81 Den(Calc)= 3.10

Crystal System:

Monoclinic Space Group: Unk.

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

By Intensity(I/I_o): 2.92(1), 3.54(0.9), 8.42(0.8),

Physical Properties of Melkovite

Cleavage:

{???} Perfect

Color:

Brownish yellow, Lemon.

Density:

2.971

Fracture:

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

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Hardness:

3 - Calcite

Luster:

Earthy (Dull)

Streak:

yellow

Optical Properties of Melkovite

Gladstone-Dale:

CI meas= -0.187 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.137 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2703,KPDmeas= 0.2821,KC= 0.2377
Ncalc = 1.71 - 1.74

Optical Data:

Biaxial (?), b=1.838

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

pale green.

Calculated Properties of Melkovite

Electron Density:

Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Melkovite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Melkovite= 67.95 barns/electron
U=PE_Melkovite x rElectron Density= 201.51 barns/cc.

Radioactivity:

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

Melkovite Classification

Dana Class:

49.04.03.01 (49)Basic and Hydrated Molybdates and Tungstates

(49.04)(Compound Anions)

(49.04.03)Dana Group

49.04.03.01 Melkovite CaFeH6(MoO4)4(PO4)•6(H2O) Unk. Mono

Strunz Class:

08.DM.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DM -With large and medium-sized cations, (OH, etc.):RO4 > 2:1

08.DM.15 Betpakdalite [Mg(H2O)6]Ca2(H2O)13[Mo8As2Fe3O36(OH)]•4(H2O) C 2/m 2/m

08.DM.15 Melkovite CaFeH6(MoO4)4(PO4)•6(H2O) Unk. Mono

08.DM.15 Natrobetpakdalite (Na,Ca)3Fe2(As2Mo6O28)•15(H2O) Unk Mono

Other Melkovite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

Search for Melkovite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Melkovite :

Ask about Melkovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Melkovite

CaFe+++H6(MoO4)4(PO4)•6(H2O)
Dana No: 49.04.03.01 Strunz No: 08.DM.15
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.