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Helmutwinklerite Mineral Data

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General Helmutwinklerite Information

Help on Chemical  Formula: Chemical Formula: PbZn2(AsO4)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 651.85 gm
   Zinc      20.06 %  Zn   24.97 % ZnO
   Arsenic   22.99 %  As   35.26 % As2O5
   Hydrogen   0.62 %  H     5.53 % H2O
   Lead      31.79 %  Pb   34.24 % PbO
   Oxygen    24.54 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbZn2(AsO4)2•2(H2O)
Help on Environment: Environment: Rare secondary mineral in corroded tennantite ore from a dolostone-hosted hydrothermal polymetallic ore deposit.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Helmut G.F. Winkler (1915-1980), University of Gottingen, Gottingen, Germany
Help on Name Pronunciation: Name Pronunciation: Helmutwinklerite + Pronunciation Say HELMUTWINKLERITE
Help on Synonym: Synonym: ICSD 76617
  PDF 33-781
 

Helmutwinklerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9992:1:1.3577
Help on Cell Dimensions: Cell Dimensions: a = 5.606, b = 5.61, c = 7.617, Z = 1; alpha = 70.19°, beta = 69.91°, gamma = 69.18° V = 197.84 Den(Calc)= 5.47
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.071(1), 4.698(0.72), 3.279(0.69),
 

Physical Properties of Helmutwinklerite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Sky blue.
Help on Density: Density: 5.3
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white
 

Optical Properties of Helmutwinklerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1598,KPDmeas= 0.1601,KC= 0.1609
Ncalc = 1.85
Help on Optical Data: Optical Data: Biaxial (+), a=1.72-1.83, b=1.8-1.87, g=1.89-1.98, bire=0.1500-0.1700, 2V(Calc)=66-88, 2V(Meas)=70.
 

Calculated Properties of Helmutwinklerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.75 gm/cc
note: Specific Gravity of Helmutwinklerite =5.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEHelmutwinklerite = 571.97 barns/electron
U=PEHelmutwinklerite x rElectron Density=2,715.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Helmutwinklerite is Not Radioactive
 

Helmutwinklerite Classification

Help on  Dana Class: Dana Class: 40.02.09.02 (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.09)Helmutwinklerite Subgroup
 
40.02.09.01 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m
 
40.02.09.02 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1
 
40.02.09.03 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m
 
40.02.09.04 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m
 
40.02.09.05 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1
 
40.02.09.06 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m
 
40.02.09.07 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m
 
40.02.09.08 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CG.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CG -With large and medium-sized cations, RO4:H2O = 1:1
 
08.CG.20 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri
 
08.CG.20 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1
 
08.CG.20 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1
 
08.CG.20 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1
 
08.CG.20 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1
 
08.CG.20 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1
 

Other Helmutwinklerite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Helmutwinklerite :
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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Helmutwinklerite Specimen Label here :

Helmutwinklerite

PbZn2(AsO4)2•2(H2O)
Dana No: 40.02.09.02 Strunz No: 08.CG.20
Locality:

 

Notes:

 

 
   
 


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