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Obradovicite-KCu

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About Obradovicite-KCuHide

Formula:
[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]
Colour:
Pea-green (RHS 149A)
Lustre:
Sub-Adamantine, Vitreous
Hardness:
Specific Gravity:
3.55
Crystal System:
Orthorhombic
Name:
Named obradovicite by Finney et al. (1986) in honor of Martin T. Obradovic, from whose mineral collection the type material came. He graduated from Colorado School of mines in 1953. In 1970 he headed the alumni association in Lima, Peru. The suffix was added in 2010 by the International Mineralogical Association in a redefinition of this and related species.
Formerly called obradovicite; redefined in 2010 (IMA 10-E). Both obradovicite-NaCu and obradovicite-KCu was found on the type specimen of "obradovicite".


Classification of Obradovicite-KCuHide

Approved
Notes:
Renamed by the IMA
First Published:
1986
Approval History:
Renamed by IMA: 2010
7.GB.40

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

49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates
22.5.10

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

Physical Properties of Obradovicite-KCuHide

Sub-Adamantine, Vitreous
Transparency:
Translucent
Colour:
Pea-green (RHS 149A)
Streak:
Pale pea-green (RHS 149C)
Hardness:
2½ on Mohs scale
Cleavage:
None Observed
Density:
3.55 g/cm3 (Measured)    3.68 g/cm3 (Calculated)

Optical Data of Obradovicite-KCuHide

Type:
Biaxial (+)
RI values:
nα = 1.790 nβ = 1.798 nγ = 1.811
2V:
Measured: 81° , Calculated: 75.7°
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r> v, extreme
Pleochroism:
Weak
Comments:
Weak yellow pleochroism, Z > X = Y

Chemical Properties of Obradovicite-KCuHide

Formula:
[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]

Crystallography of Obradovicite-KCuHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmna
Cell Parameters:
a = 15.046 Å, b = 14.848 Å, c = 11.056 Å
Ratio:
a:b:c = 1.013 : 1 : 0.745
Unit Cell V:
2,469.94 ų (Calculated from Unit Cell)
Z:
4
Morphology:
a{100}, m {110}, and d{011}
Twinning:
None observed.
Comment:
Pnmb

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.565 Å(80)
8.906 Å(100)
7.424 Å(80)
5.733 Å(50)
3.761 Å(30)
3.686 Å(40)
3.466 Å(30)
3.344 Å(40)

Type Occurrence of Obradovicite-KCuHide

General Appearance of Type Material:
dense clusters of platy crystals to 0.1 mm
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:
Reference:
Finney, J.J., Williams, S.A., Hamilton, R.D. (1986) Obradovicite, a new complex arsenate-molybdate from Chuquicamata, Chile. Mineralogical Magazine: 50: 283-284.

Synonyms of Obradovicite-KCuHide

Other Language Names for Obradovicite-KCuHide

Relationship of Obradovicite-KCu to other SpeciesHide

Other Members of this group:
Obradovicite-NaCuNa2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3] Orth. mmm (2/m 2/m 2/m) : Pmna
Obradovicite-NaNa[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] Orth.

Related Minerals - Nickel-Strunz GroupingHide

7.GB.05LindgreniteCu3(MoO4)2(OH)2Mon. 2/m : P21/m
7.GB.10SzenicsiteCu3(MoO4)(OH)4Orth.
7.GB.15CuprotungstiteCu2(WO4)(OH)2Tet. 4 2 2 : P41 21 2
7.GB.15UM1999-38-WO:CrV(V, Cr, W, O, H) [V:Cr:W ratio about 2:1:3]
7.GB.20Phyllotungstite(H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.GB.25RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2OMon. 2/m : P21/m
7.GB.30FerrimolybditeFe2(MoO4)3 · nH2OOrth. mmm (2/m 2/m 2/m) : Pmmn
7.GB.35AnthoiniteAlWO3(OH)3Tric. 1
7.GB.35MpororoiteWAlO3(OH)3 · 2(H2O)
7.GB.45Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
7.GB.45Paramendozavilite[KAl4(H2O)30][Mo12P6Fe3+6O60(OH)13]Mon.
7.GB.50Tancaite-(Ce)FeCe(MoO4)3·3H2O Trig. 3 : R3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.5.1VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
22.5.2EmbreyitePb5(CrO4)2(PO4)2 · H2OMon. 2/m : B2/m
22.5.3CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
22.5.4FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
22.5.5MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)Mon.
22.5.6Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
22.5.7Paramendozavilite[KAl4(H2O)30][Mo12P6Fe3+6O60(OH)13]Mon.
22.5.8Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.9Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
22.5.11Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.12RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2OMon. 2/m : P21/m
22.5.13OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
22.5.14JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.

Fluorescence of Obradovicite-KCuHide

does not fluoresce under SW

Other InformationHide

Notes:
It is insoluble in cold 1:1 HNO3 but dissolves rapidly upon heating, readily soluble in cold 1:1 HCl, rapidly turns dull brick orange in 40% KOH, and is unaffected by 20% NH4OH.
Health Risks:
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-KCuHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Finney, J.J., Williams, S.A., Hamilton, R.D. (1986) Obradovicite, a new complex arsenate-molybdate from Chuquicamata, Chile. Mineralogical Magazine: 50: 283-284
Hawthorne, F.C., Jambor, J.L., Bladh, K.W., Burke, E.A.J., Grice, J.D., Phillips, D., Roberts, A.C., Schedler, R.A., Shigley, J.E. (1987) New mineral names. American Mineralogist: 72: 1023-1028.
Williams, P.A., Hatert, F., Pasero, M., Mills, S.J. (2011) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 7. New minerals and nomenclature modifications approved in 2010. Mineralogical Magazine: 75: 27-31.
Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012) The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine: 76: 1175-1207.

Internet Links for Obradovicite-KCuHide

Localities for Obradovicite-KCuHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Northern Territory
    • Darwin
Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76, 1175-1207.
Chile (TL)
 
  • Antofagasta
    • El Loa Province
      • Calama
        • Chuquicamata District
Finney, J. J., Williams, S. A., Hamilton, R. D. (1986) Obradovicite, a new complex arsenate-molybdate from Chuquicamata, Chile. Mineralogical Magazine: 50: 283-284; Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76, 1175-1207.
 
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