Obradovicite Mineral Data +

John Betts Fine Minerals

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:	H4K0.7Na0.2CuFe3+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.
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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcnm
X Ray Diffraction:	By Intensity(I/Io): 8.906(1), 7.424(0.8), 10.565(0.8),
Physical Properties of Obradovicite
Cleavage:	None
Color:	Pea green.
Density:	3.55
Diaphaniety:	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
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:	relectron=3.17 gm/cc note: rObradovicite =3.30 gm/cc.
Fermion Index	Fermion Index = 0.09757 Boson Index = 0.90243
Photoelectric:	PEObradovicite = 67.51 barns/electron U=PEObradovicite x relectron= 214.14 barns/cc.
Radioactivity:	GRapi = 30.21 (Gamma Ray American Petroleum Institute Units) Estimated Radioactivity from Obradovicite - barely detectable
Obradovicite Classification
Dana Class:	49.4.2.1 (49)Basic and Hydrated Molybdates and Tungstates
	(49.4)(Compound Anions)
	(49.4.2)Dana Group
	49.4.2.1 Obradovicite H4(K,Na)CuFe2(AsO4)(MoO4)5·12(H2O) Pcnm 2/m 2/m 2/m
Strunz Class:	VII/C.33-40 VII - Phosphates, Arsenates and Vanadates
	VII/C - Water-bearing phosphates without unfamiliar anions, molybdophosphates with [MoO4]2- - [PO4]3- and similar
	VII/C.33 - Melkovite - Obradovicite series
	VII/C.33-10 Melkovite CaFeH6(MoO4)4(PO4)·6(H2O) Unk. Mono
	VII/C.33-20 Sodium-betpakdalite (Na,Ca)3Fe2(As2Mo6O28)·15(H2O) Unk Mono
	VII/C.33-30 Betpakdalite [Mg(H2O)6]Ca2(H2O)13[Mo8As2Fe3O36(OH)]·4(H2O) C 2/m 2/m
	VII/C.33-40 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Obradovicite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Obradovicite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Obradovicite Mineral Data : Ask about Obradovicite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español Print or Cut-and-Paste your Obradovicite Specimen Label here : Obradovicite H4(K,Na)Cu++Fe+++2(AsO4)(MoO4)5·12(H2O) Dana No: 49.4.2.1 Strunz No: VII/C.33-40 Locality:   Notes: