Namuwite Mineral Data

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.

Name Pronunciation:

Namuwite

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:

Hexagonal Space 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),

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
Ncalc = 1.58

Optical Data:

Uniaxial (?), b=1.577.

Calculated Properties of Namuwite

Electron Density:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Namuwite =2.77 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Namuwite= 22.77 barns/electron
U=PE_Namuwite x rElectron Density= 62.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Namuwite is Not Radioactive

Namuwite Classification

Dana Class:

31.04.07.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.04)where (A+ B++)4 (XO4) Zqï¿½x(H2O)

(31.04.07)Dana Group

31.04.07.01 Namuwite (Zn,Cu)4(SO4)(OH)6•4(H2O) Unk Hex

Strunz Class:

07.DD.50 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.50 Namuwite (Zn,Cu)4(SO4)(OH)6•4(H2O) Unk Hex

Other Namuwite Information

References:

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

See Also:

Links to other databases for Namuwite :
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 Namuwite Specimen Label here :

Namuwite

(Zn,Cu)4(SO4)(OH)6•4(H2O)
Dana No: 31.04.07.01 Strunz No: 07.DD.50
Locality:

Notes:

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