Obradovicite Mineral Data

Obradovicite Mineral Data +

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General Obradovicite Information

Chemical Formula:

H4(K,Na)Cu++Fe+++2(AsO4)(MoO4)5·12(H2O)

Composition:

Molecular Weight = 1,257.18 gm

Potassium 2.18 % K 2.62 % K₂O

Sodium 0.37 % Na 0.49 % Na₂O

Iron 0.80 % Fe 1.14 % Fe₂O₃

Copper 5.05 % Cu 5.69 % Cu₂O

Molybdenum 38.16 % Mo 57.25 % MoO₃

Arsenic 5.96 % As 9.14 % As₂O₅

Hydrogen 2.18 % H 19.49 % H₂O

Oxygen 45.31 % O

______ ______

100.00 % 95.83 % = TOTAL OXIDE

Empirical Formula:

H₄K_0.7Na_0.2CuFe³⁺_0.18(AsO₄)(MoO₄)₅·11.6(H₂O)

Environment:

Secondary mineral in the oxidized zone of a Cu-Mo deposit.

IMA Status:

Approved IMA 1986

Locality:

Chuquicamata, Antofagasta, Chile. Link to MinDat.org Location Data.

Name Origin:

Named for Martin T. Obradovic, who provided the type material.

Obradovicite Image

Images:

Obradovicite

Comments: Brownish yellow obradovicite coatings on quartz.
Location: Chuquicamata, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Obradovicite Crystallography

Axial Ratios:

a:b:c =1.0375:1:0.7446

Cell Dimensions:

a = 15.406, b = 14.848, c = 11.056, Z = 4; V = 2,529.04 Den(Calc)= 3.30

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcnm

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

By Intensity(I/I_o): 8.906(1), 7.424(0.8), 10.565(0.8),

Physical Properties of Obradovicite

Cleavage:

None

Color:

Pea green.

Density:

3.55

Diaphaniety:

Translucent

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Streak:

light green

Optical Properties of Obradovicite

Gladstone-Dale:

CI meas= 0.06 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2423,KPDmeas= 0.2253,KC= 0.2397

Optical Data:

Biaxial (+), a=1.79, b=1.798, g=1.811, bire=0.0210, 2V(Calc)=78, 2V(Meas)=81. Dispersion extreme.

Pleochroism (x):

weak yellow.

Pleochroism (y):

weaker yellow.

Pleochroism (z):

weak yellow.

Calculated Properties of Obradovicite

Electron Density:

r_electron=3.17 gm/cc
note: r_Obradovicite=3.30 gm/cc.

Fermion Index

Fermion Index = 0.09757
Boson Index = 0.90243

Photoelectric:

PE_Obradovicite= 67.51 barns/electron
U=PE_Obradovicite x r_electron= 214.14 barns/cc.

Radioactivity:

GRapi = 30.21 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Obradovicite - barely detectable

Obradovicite Classification

Dana Class:

49.4.2.1 (49)Basic and Hydrated Molybdates and Tungstates

(49.4)(Compound Anions)

(49.4.2)Dana Group

49.4.2.1 Obradovicite H4(K,Na)CuFe2(AsO4)(MoO4)5·12(H2O) Pcnm 2/m 2/m 2/m

Strunz Class:

VII/C.33-40 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 Obradovicite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Obradovicite :
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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Obradovicite

H4(K,Na)Cu++Fe+++2(AsO4)(MoO4)5·12(H2O)
Dana No: 49.4.2.1 Strunz No: VII/C.33-40
Locality:

Notes: