Melkovite Mineral Data

Melkovite Mineral Data +

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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.

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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:

MonoclinicSpace 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

Optical Data:

Biaxial (?), b=1.838

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

pale green.

Calculated Properties of Melkovite

Electron Density:

r_electron=2.97 gm/cc
note: r_Melkovite=3.10 gm/cc.

Fermion Index

Fermion Index = 0.10565
Boson Index = 0.89435

Photoelectric:

PE_Melkovite= 67.95 barns/electron
U=PE_Melkovite x r_electron= 201.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Melkovite is Not Radioactive

Melkovite Classification

Dana Class:

49.4.3.1 (49)Basic and Hydrated Molybdates and Tungstates

(49.4)(Compound Anions)

(49.4.3)Dana Group

49.4.3.1 Melkovite CaFeH6(MoO4)4(PO4)·6(H2O) Unk. Mono

Strunz Class:

VII/C.33-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, molybdophosphates with [MoO4]2- - [PO4]3- and similar

VII/C.33 - Melkovite - Obradovicite series

VII/C.33-10 Melkovite CaFeH6(MoO4)4(PO4)·6(H2O) Unk. Mono

VII/C.33-20 Sodium-betpakdalite (Na,Ca)3Fe2(As2Mo6O28)·15(H2O) Unk Mono

VII/C.33-30 Betpakdalite [Mg(H2O)6]Ca2(H2O)13[Mo8As2Fe3O36(OH)]·4(H2O) C 2/m 2/m

VII/C.33-40 Obradovicite H4(K,Na)CuFe2(AsO4)(MoO4)5·12(H2O) Pcnm 2/m 2/m 2/m

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 -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 -École des Mines de Paris

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

Melkovite

CaFe+++H6(MoO4)4(PO4)·6(H2O)
Dana No: 49.4.3.1 Strunz No: VII/C.33-10
Locality:

Notes: