Mineralogy Database

Obradovicite Mineral Data

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General Obradovicite Information

Help on Chemical  Formula: Chemical Formula: H4(K,Na)Cu++Fe+++2(AsO4)(MoO4)5•12(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: H4K0.7Na0.2CuFe3+0.18(AsO4)(MoO4)5•11.6(H2O)
Help on Environment: Environment: Secondary mineral in the oxidized zone of a Cu-Mo deposit.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: Chuquicamata, Antofagasta, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Martin T. Obradovic, who provided the type material.
Help on Name Pronunciation: Name Pronunciation: Obradovicite + Pronunciation Say OBRADOVICITE

Obradovicite Image

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

Obradovicite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0375:1:0.7446
Help on Cell Dimensions: Cell Dimensions: a = 15.406, b = 14.848, c = 11.056, Z = 4; V = 2,529.04 Den(Calc)= 3.30
Help on Crystal System: 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/Io): 8.906(1), 7.424(0.8), 10.565(0.8),

Physical Properties of Obradovicite

Help on Cleavage: Cleavage: None
Help on Color: Color: Pea green.
Help on Density: Density: 3.55
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Streak: Streak: light green

Optical Properties of Obradovicite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.79, b=1.798, g=1.811, bire=0.0210, 2V(Calc)=78, 2V(Meas)=81. Dispersion extreme.
Help on Pleochroism (x): Pleochroism (x): weak yellow.
Help on Pleochroism (y): Pleochroism (y): weaker yellow.
Help on Pleochroism (z): Pleochroism (z): weak yellow.

Calculated Properties of Obradovicite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Obradovicite =3.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEObradovicite = 67.51 barns/electron
U=PEObradovicite x relectron= 214.14 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (49)Basic and Hydrated Molybdates and Tungstates
  (49.04)(Compound Anions)
  (49.04.02)Dana Group Obradovicite H4(K,Na)CuFe2(AsO4)(MoO4)5•12(H2O) Pcnm 2/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: 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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Dana No: Strunz No: 07.GB.40





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