Wherryite Mineral Data

Wherryite Mineral Data +

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General Wherryite Information

Chemical Formula:

Pb7Cu2(SO4)4(SiO4)2(OH)2

Composition:

Molecular Weight = 2,243.47 gm

Copper 8.50 % Cu 10.64 % CuO

Silicon 2.50 % Si 5.36 % SiO₂

Hydrogen 0.09 % H 0.80 % H₂O

Lead 64.65 % Pb 69.64 % PbO

Sulfur 5.72 % S 14.28 % SO₃

Oxygen 18.54 % O

______ ______

100.00 % 100.71 % = TOTAL OXIDE

Empirical Formula:

Pb₇Cu₃(SO₄)₄(SiO₄)₂(OH)₂

Environment:

Found wiith other secondary lead minerals.

IMA Status:

Valid Species (Pre-IMA) 1950

Locality:

Mammoth mine, Tiger, Pinal County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Edgar T. Wherry (1885-1982), American mineralogist and plant ecologist.

Synonym:

ICSD 79171

PDF 23-218

Wherryite Image

Images:

Wherryite

Comments: Green, acicular wherryite crystals.
Location: Mammoth mine, Tiger, Pinal County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Wherryite Crystallography

Axial Ratios:

a:b:c =3.5923:1:1.5797

Cell Dimensions:

a = 20.789, b = 5.787, c = 9.142, Z = 2; beta = 91.24° V = 1,099.58 Den(Calc)= 6.78

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.16(1), 2.75(0.5), 3.06(0.45),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 32 (1994) p.373-380, The crystal structure of wherryite, Pb7Cu2(SO4)4(SiO4)2(OH)2, a mixed, sulfate-silicate with [M(TO4)2] chains

Physical Properties of Wherryite

Color:

Yellow green, Light green, Light yellow.

Density:

6.45

Diaphaniety:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Luster:

Vitreous - Adamantine

Optical Properties of Wherryite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1463,KPDmeas= 0.1538,KC= 0.1498

Optical Data:

Biaxial (-), a=1.942, b=2.01, g=2.024, bire=0.0820, 2V(Calc)=46, 2V(Meas)=50.

Calculated Properties of Wherryite

Electron Density:

r_electron=5.82 gm/cc
note: r_Wherryite=6.78 gm/cc.

Fermion Index

Fermion Index = 0.14456
Boson Index = 0.85544

Photoelectric:

PE_Wherryite=1,160.70 barns/electron
U=PE_Wherryite x r_electron=6,755.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wherryite is Not Radioactive

Wherryite Classification

Dana Class:

32.3.3.1 (32)Compound Sulfates

(32.3)(anhydrous) with poly-anionic formula

(32.3.3)Dana Group

32.3.3.1 Wherryite Pb7Cu2(SO4)4(SiO4)2(OH)2 C 2/m 2/m

Strunz Class:

VIII/B.28-25 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with groups [SO4]2-, [CrO4]2- and [PO4]3-

VIII/B.28 - Iranite - Macquartite series

VIII/B.28-10 Iranite Pb10Cu(CrO4)6(SiO4)2(F,OH)2 P1 1

VIII/B.28-20 Hemihedrite Pb10Zn(CrO4)6(SiO4)2F2 P1 1

VIII/B.28-25 Wherryite Pb7Cu2(SO4)4(SiO4)2(OH)2 C 2/m 2/m

VIII/B.28-30 Macquartite Pb3Cu(CrO4)(SiO3)(OH)4·2(H2O) C 2/m ? 2/m

Other Wherryite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Wherryite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Wherryite

Pb7Cu2(SO4)4(SiO4)2(OH)2
Dana No: 32.3.3.1 Strunz No: VIII/B.28-25
Locality:

Notes: