Namuwite Mineral Data

Namuwite Mineral Data +

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General Namuwite Information

Chemical Formula:

(Zn,Cu)4(SO4)(OH)6·4(H2O)

Composition:

Molecular Weight = 528.04 gm

Zinc 24.77 % Zn 30.83 % ZnO

Copper 24.07 % Cu 30.13 % CuO

Hydrogen 2.67 % H 23.88 % H₂O

Sulfur 6.07 % S 15.16 % SO₃

Oxygen 42.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₂Cu₂(SO₄)(OH)₆·4(H₂O)

Environment:

Encrusting hydrozincite.

IMA Status:

Approved IMA 1982

Locality:

Averllyn lead mine, Llanrwst mining district, northern Wales. Link to MinDat.org Location Data.

Name Origin:

Named for the country of origin, and the National Museum of Wales.

Synonym:

ICSD 81353

PDF 35-528

Namuwite Image

Images:

Namuwite

Comments: Sky-blue, platy crystals of namuwite on matrix.
Location: Gelbe Birke Mine, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Namuwite Crystallography

Axial Ratios:

a:c = 1:1.26658

Cell Dimensions:

a = 8.29, c = 10.5, Z = 2; V = 624.93 Den(Calc)= 2.81

Crystal System:

HexagonalSpace Group: Unk

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

By Intensity(I/I_o): 10.59(1), 2.71(0.42), 2.63(0.41),

Crystal Structure:

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Groat L A , American Mineralogist , 81 (1996) p.238-243, The crystal structure of namuwite, a mineral with Zn in tetrahedral and, octahedral coordination, and its relationship to the synthetic basic zinc, sulfates, Note: U(1,2) for S has been changed to match symmetry constraints.

Physical Properties of Namuwite

Cleavage:

[0001] Perfect

Color:

Light green, Pale sea green.

Density:

2.77

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2 - Gypsum

Luster:

Pearly

Streak:

pale green

Optical Properties of Namuwite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2053,KPDmeas= 0.2083,KC= 0.208

Optical Data:

Uniaxial (?), b=1.577.

Calculated Properties of Namuwite

Electron Density:

r_electron=2.73 gm/cc
note: r_Namuwite=2.77 gm/cc.

Fermion Index

Fermion Index = 0.01081
Boson Index = 0.98919

Photoelectric:

PE_Namuwite= 22.77 barns/electron
U=PE_Namuwite x r_electron= 62.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Namuwite is Not Radioactive

Namuwite Classification

Dana Class:

31.4.7.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.4)where (A+ B++)4 (XO4) Zq·x(H2O)

(31.4.7)Dana Group

31.4.7.1 Namuwite (Zn,Cu)4(SO4)(OH)6·4(H2O) Unk Hex

Strunz Class:

VI/D.03-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.03 - Langite series, Posnjakite - Nakuriite

VI/D.03-10 Posnjakite Cu4(SO4)(OH)6·(H2O) C 2/c 2/m

VI/D.03-20 Langite Cu4(SO4)(OH)6·2(H2O) Pc m

VI/D.03-30 Wroewolfeite Cu4(SO4)(OH)6·2(H2O) Pc m

VI/D.03-40 Namuwite (Zn,Cu)4(SO4)(OH)6·4(H2O) Unk Hex

VI/D.03-50 Guarinoite (Zn,Co,Ni)6(SO4)(OH,Cl)10·5(H2O) P 6₃/m,P 6₃, or P 6₃22 Hex

VI/D.03-55 Theresemagnanite (Co,Zn,Ni)6(SO4)(OH,Cl)10·8(H2O) P 6₃ 6

VI/D.03-60 Schulenbergite (Cu,Zn)7(SO4,CO3)2(OH)10·3(H2O) P 3 or P 3- Trig

VI/D.03-65 Christelite! Zn3Cu2(SO4)2(OH)6·4(H2O) P1 1

VI/D.03-70 Ktenasite (Cu,Zn)5(SO4)2(OH)6·6(H2O) P 2₁/c 2/m

VI/D.03-75 Ramsbeckite (Cu,Zn)15(SO4)4(OH)22·6(H2O) P 2₁/a 2/m

VI/D.03-80 Campigliaite Cu4Mn(SO4)2(OH)6·4(H2O) C 2 2

VI/D.03-90 Nakauriite (Mn,Ni,Cu)8(SO4)4(CO3)(OH)6·48(H2O) Unk Ortho

Other Namuwite Information

References:

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

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Namuwite

(Zn,Cu)4(SO4)(OH)6·4(H2O)
Dana No: 31.4.7.1 Strunz No: VI/D.03-40
Locality:

Notes: