General Namuwite Information
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Chemical Formula: |
(Zn,Cu)4(SO4)(OH)6·4(H2O) |
Composition: |
Molecular Weight = 528.04 gm |
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Zinc 24.77 % Zn 30.83 % ZnO |
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Copper 24.07 % Cu 30.13 % CuO |
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Hydrogen 2.67 % H 23.88 % H2O |
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Sulfur 6.07 % S 15.16 % SO3 |
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Oxygen 42.42 % O |
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______ ______ |
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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 |
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PDF 35-528 |
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Namuwite Image |
Images:
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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 |
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Namuwite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 10.59(1), 2.71(0.42), 2.63(0.41), |
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
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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.
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Physical Properties of Namuwite
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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 |
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Optical Properties of Namuwite
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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. |
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Calculated Properties of Namuwite
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Electron Density: |
relectron=2.73 gm/cc note: rNamuwite =2.77 gm/cc. |
Fermion Index |
Fermion Index = 0.01081 Boson Index = 0.98919 |
Photoelectric: |
PENamuwite = 22.77 barns/electron U=PENamuwite x relectron= 62.11 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Namuwite is Not Radioactive |
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Namuwite Classification
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Dana Class: |
31.4.7.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen |
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(31.4)where (A+ B++)4 (XO4) Zq·x(H2O) |
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(31.4.7)Dana Group |
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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 |
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VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size |
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VI/D.03 - Langite series, Posnjakite - Nakuriite |
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VI/D.03-10 Posnjakite Cu4(SO4)(OH)6·(H2O) C 2/c 2/m |
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VI/D.03-20 Langite Cu4(SO4)(OH)6·2(H2O) Pc m |
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VI/D.03-30 Wroewolfeite Cu4(SO4)(OH)6·2(H2O) Pc m |
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VI/D.03-40 Namuwite (Zn,Cu)4(SO4)(OH)6·4(H2O) Unk Hex |
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VI/D.03-50 Guarinoite (Zn,Co,Ni)6(SO4)(OH,Cl)10·5(H2O) P 63/m,P 63, or P 6322 Hex |
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VI/D.03-55 Theresemagnanite (Co,Zn,Ni)6(SO4)(OH,Cl)10·8(H2O) P 63 6 |
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VI/D.03-60 Schulenbergite (Cu,Zn)7(SO4,CO3)2(OH)10·3(H2O) P 3 or P 3- Trig |
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VI/D.03-65 Christelite! Zn3Cu2(SO4)2(OH)6·4(H2O) P1 1 |
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VI/D.03-70 Ktenasite (Cu,Zn)5(SO4)2(OH)6·6(H2O) P 21/c 2/m |
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VI/D.03-75 Ramsbeckite (Cu,Zn)15(SO4)4(OH)22·6(H2O) P 21/a 2/m |
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VI/D.03-80 Campigliaite Cu4Mn(SO4)2(OH)6·4(H2O) C 2 2 |
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VI/D.03-90 Nakauriite (Mn,Ni,Cu)8(SO4)4(CO3)(OH)6·48(H2O) Unk Ortho |
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Other Namuwite Information
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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 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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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:
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