Helmutwinklerite Mineral Data

Helmutwinklerite Mineral Data +

General Helmutwinklerite Information

Chemical Formula:

PbZn2(AsO4)2·2(H2O)

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

Empirical Formula:

PbZn₂(AsO₄)₂·2(H₂O)

IMA Status:

Approved IMA 1980

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 76617

PDF 33-781

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Helmutwinklerite Crystallography

Axial Ratios:

a:b:c =0.9992:1:1.3577

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.071(1), 4.698(0.72), 3.279(0.69),

Crystal Structure:

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Krause W , Belendorff K , Bernhardt H J , McCammon C A , Effenberger H , Mikenda W , European Journal of Mineralogy , 10 (1998) p.179-206, Crystal chemistry of the tsumcorite-group minerals. New data on ferrilotharmeyerite,, tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefinition of gartrellite

Physical Properties of Helmutwinklerite

Cleavage:

None

Color:

Colorless, Sky blue.

Density:

5.3

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Helmutwinklerite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1551,KPDmeas= 0.1601,KC= 0.1609

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

Electron Density:

r_electron=4.75 gm/cc
note: r_{Helmutwinklerite}=5.30 gm/cc.

Fermion Index

Fermion Index = 0.07859
Boson Index = 0.92141

Photoelectric:

PE_{Helmutwinklerite}= 571.97 barns/electron
U=PE_{Helmutwinklerite} x r_electron=2,715.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Helmutwinklerite is Not Radioactive

Helmutwinklerite Classification

Dana Class:

40.2.9.2 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.9)Helmutwinklerite Subgroup

40.2.9.1 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

40.2.9.2 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

40.2.9.3 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

40.2.9.4 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.5 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

40.2.9.6 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.7 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.8 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

VII/C.31-100 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.31 - Mawbyite - Gartrellite series

VII/C.31-02 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-04 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-05 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-06 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

VII/C.31-08 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-10 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-20 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

VII/C.31-30 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-35 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-36 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-40 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

VII/C.31-50 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

VII/C.31-74 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

VII/C.31-78 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1

VII/C.31-80 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1

VII/C.31-90 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri

VII/C.31-92 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1

VII/C.31-98 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

VII/C.31-100 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

Other Helmutwinklerite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Helmutwinklerite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Helmutwinklerite

PbZn2(AsO4)2·2(H2O)
Dana No: 40.2.9.2 Strunz No: VII/C.31-100
Locality:

Notes: