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Obradovicite

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

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, 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.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
,PO
 
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
German names:
Obradovicit
Spanish names:
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

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    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.
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    (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
    		Min.Mag.(1986) 50, 283-284
    Mineral and/or Locality
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