Obradovicite Mineral Data

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.

Name Pronunciation:

Obradovicite + Pronunciation

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 - Dipyramidal H-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

Diaphaneity:

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
Ncalc = 1.79 - 1.85

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:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Obradovicite =3.30 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

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)
Concentration of Obradovicite per GRapi unit = 3.31 (%)

Estimated Radioactivity from Obradovicite - barely detectable

Obradovicite Classification

Dana Class:

49.04.02.01 (49)Basic and Hydrated Molybdates and Tungstates

(49.04)(Compound Anions)

(49.04.02)Dana Group

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

Strunz Class:

07.GB.40 07 - SULFATES (SELENATES, TELLURATES)

07.G - Molybdates, Wolframates and Niobates

07.GB -With additional anions and/or H2O

07.GB.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 - 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

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Obradovicite

H4(K,Na)Cu++Fe+++2(AsO4)(MoO4)5•12(H2O)
Dana No: 49.04.02.01 Strunz No: 07.GB.40
Locality:

Notes:

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