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Obradovicite

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Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile
© Brent Thorne 2008

Show Obradovicite Photos (3)
Formula:
H
 
4
(K,Na)CuFe
 
2
AsO
 
4
(MoO
 
4
)
 
5
·12H
 
2
O
System:OrthorhombicColour:pea-green (RHS 149A)
Hardness:2½
Name:Named for Martin T. Obradovic, from whose mineral collection the type material came.
This page provides mineralogical data about Obradovicite.

Classification of Obradovicite

IMA status:Approved
Strunz 8th edition ID:7/C.33-40
Strunz 9th edition ID:7.GB.40
Nickel-Strunz 10th (pending) edition ID:7.GB.40

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
Dana 8th edition ID:49.4.2.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates
Hey's CIM Ref.:22.5.10

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate
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Type Occurrence of Obradovicite

Type Locality:Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile
General Appearance of Type Material:dense clusters of platy crystals
Place of Conservation of Type Material:Colorado School of Mines Museum, and National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
Geological Setting of type material:on brecciated, slightly leached, vein quartz or on crusts of earthy tan jarosite
Associated Minerals at type locality:
JarositeQuartz

Physical Properties of Obradovicite

Diaphaneity (Transparency):Translucent
Colour:pea-green (RHS 149A)
Streak:pale pea-green (RHS 149C)
Hardness (Mohs):2½
Cleavage:None Observed
Density (measured):3.55 g/cm3
Density (calculated):3.68 g/cm3

Crystallography of Obradovicite

Crystal System:Orthorhombic
Cell Parameters:a = 15.046Å, b = 14.848Å, c = 11.056Å
Ratio:a:b:c = 1.013 : 1 : 0.745
Unit Cell Volume:V 2,469.94 ų (Calculated from Unit Cell)
Z:4
Morphology:a{100}, m {110}, and d{011}
X-Ray Powder Diffraction:
d-spacingIntensity
10.565 (80)
8.906 (100)
7.424 (80)
5.733 (50)
3.761 (30)
3.686 (40)
3.466 (30)

Optical Data of Obradovicite

Type:Biaxial (+)
RI values: nα = 1.790 nβ = 1.798 nγ = 1.811
2V:Measured: 81° , Calculated: 78°
Maximum Birefringence:δ = 0.021

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:extreme
Pleochroism:Weak
Comments:Weak yellow pleochroism, Z > X = Y

Chemical Properties of Obradovicite

Formula:
H
 
4
(K,Na)CuFe
 
2
AsO
 
4
(MoO
 
4
)
 
5
·12H
 
2
O
Essential elements:As, Cu, Fe, H, K, Mo, O
All elements listed in formula:As, Cu, Fe, H, K, Mo, Na, O

Relationship of Obradovicite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.GB.05Lindgrenite
Cu
 
3
[OH|MoO
 
4
]
 
2
7.GB.10Szenicsite
Cu
 
3
(MoO
 
4
)(OH)
 
4
7.GB.15Cuprotungstite
Cu
 
2
[(OH)
 
2
|WO
 
4
]
7.GB.15UM1999-38-WO:CrV
V, Cr, W, O, H [V:Cr:W ratio about· 2:1:3]
7.GB.20Phyllotungstite
Ca
 
x
[(W,Fe)(O,OH)
 
3
]·yH
 
2
O
7.GB.25Rankachite
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH)•(Ca
 
x
H
 
2
O
 
y
) with x ~ 0.5, y ~ 2.
7.GB.30Ferrimolybdite
Fe
 
2
[MoO
 
4
]
 
3
 · nH
 
2
O
7.GB.35Anthoinite
WAlO
 
3
(OH)
 
3
 (?)
7.GB.35Mpororoite
AlWO
 
3
(OH)
 
3
·2H
 
2
O
7.GB.45Mendozavilite
Na(Ca,Mg)
 
2
[Fe
 
6
(PO
 
4
)
 
2
(PMo
 
11
O
 
39
)(OH,Cl)
 
10
]·33H
 
2
O
7.GB.45Paramendozavilite
NaAl
 
4
[Fe
 
7
(PO
 
4
)
 
5
(PMo
 
12
O
 
40
)(OH)
 
16
]·56H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.5.1Vauquelinite
Pb
 
2
Cu[OH|PO
 
4
|CrO
 
4
]
22.5.2Embreyite
Pb
 
5
[PO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
22.5.3Cassedanneite
Pb
 
5
[VO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
22.5.4Fornacite
Pb
 
2
Cu[OH|AsO
 
4
|CrO
 
4
]
22.5.5Molybdofornacite
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|(MoO
 
4
,CrO
 
4
)]
22.5.6Mendozavilite
Na(Ca,Mg)
 
2
[Fe
 
6
(PO
 
4
)
 
2
(PMo
 
11
O
 
39
)(OH,Cl)
 
10
]·33H
 
2
O
22.5.7Paramendozavilite
NaAl
 
4
[Fe
 
7
(PO
 
4
)
 
5
(PMo
 
12
O
 
40
)(OH)
 
16
]·56H
 
2
O
22.5.8Betpakdalite
{Mg(H
 
2
O)
 
6
}Ca
 
2
(H
 
2
O)
 
13
[Mo
6+
8
As
5+
2
Fe
3+
3
O
 
36
(OH)](H
 
2
O)
 
4
22.5.9Natrobetpakdalite
(Na
 
2
,Ca)Fe
 
2
(As
 
2
Mo
 
6
O
 
28
)·15H
 
2
O
22.5.11Melkovite
CaFeH
 
6
(MoO
 
4
)
 
4
PO
 
4
·6H
 
2
O or near·
22.5.12Rankachite
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH)•(Ca
 
x
H
 
2
O
 
y
) with x ~ 0.5, y ~ 2.
22.5.13Olmsteadite
KFe
2+
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
 · 2H
 
2
O
22.5.14Johnwalkite
K(Mn
2+
 
,Fe
2+
 
,Fe
3+
 
)
 
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
 · 2(H
 
2
O,OH)

Other Names for Obradovicite

Synonyms:
IMA1978-061
Other Languages:
German:Obradovicit
Spanish:Obradovicita

Other Information

Fluorescence in UV light:does not fluoresce under SW
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Obradovicite

Reference List:J.J.Finney, S.A.Williams & R.D.Hamilton, "Obradovicite, a new complex arsenate-molybdate from Chuquicamata, Chile":Mineralogical Magazine (1986): 50: 283-284.
[abstract: American Mineralogist (1987): 72: 1026]

Internet Links for Obradovicite

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    Localities for Obradovicite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Antofagasta Region
      • El Loa Province
        • Calama
          • Chuquicamata District
    		Min.Mag.(1986) 50, 283-284
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 9th Nov 2009 22:14:12