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Serpieri Mine, Kamariza Mines (Kamareza Mines), Agios Konstantinos [St Constantine] (Kamariza), Lavrion District Mines, Lavrion District (Laurion; Laurium), Attikí Prefecture (Attica; Attika), Greece
© Brent thorne
|Measured Zn:Cu ratios in samples from different localities: 2.5:1.5; 2.3:1.7; 3.3:0.8.|
Compare the closely related (but Cu-free) Unnamed (Basic Zinc Sulphate Hydrate).
Note: Well-developed, tabular "Namuwite" crystals from some slag localities in the Hartz mountains, Germany, are in fact Unnamed (Gordaite-related Ca-Zn Sulphate Chloride Hydrate) (U. Kolitsch, unpubl. data).
May appear visually similar to schulenbergite and minohlite.
Classification of Namuwite
|Strunz 8th edition ID:||6/D.03-40|
|Nickel-Strunz 10th (pending) edition ID:||7.DD.50|
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
|Dana 8th edition ID:||22.214.171.124|
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
4 : (AB)4(XO4)Zq·xH2O
|Hey's CIM Ref.:||25.5.3|
25 : Sulphates
5 : Sulphates of Zn and Hg
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Type Occurrence of Namuwite
|Type Locality:||Aberllyn Mine, Betws-y-coed, Gwydyr Forest area, Conwy (Gwynedd; Caernarvonshire), Wales, UK|
|Year of Discovery:||1982|
Physical Properties of Namuwite
|Density (measured):||2.77 g/cm3|
|Density (calculated):||2.81 g/cm3|
Crystallography of Namuwite
|Class (H-M):||3 - Rhombohedral|
|Cell Parameters:||a = 8.330(1) Å, c = 10.540(2) Å|
|Ratio:||a:c = 1 : 1.265|
|Unit Cell Volume:||V 633.38 Å³ (Calculated from Unit Cell)|
|Morphology:||60 micron hexagonal plates.|
|X-Ray Powder Diffraction:|
Optical Data of Namuwite
|Comments:||Crystal form did not allow for accurate measure of refractive index of extraordinary ray.|
Chemical Properties of Namuwite
Measured Zn:Cu ratios in samples from different localities: 2.5:1.5; 2.3:1.7; 3.3:0.8.
|Essential elements:||H, O, S, Zn|
|All elements listed in formula:||Cu, H, O, S, Zn|
Relationship of Namuwite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Namuwite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Namuwite
Bevins, R. E., Turgoose, S. & Williams, P. A. (1982): Namuwite, (Zn,Cu)4SO4(OH)6·4H2O, a new mineral from Wales. Mineral. Mag., 46, 51-54.
American Mineralogist (1983): 68: 281.
Lee Groat (1996) The crystal structure of namuwite, a mineral with Zn in tetrahedral and octahedral coordination, and its relationship to the synthetic basic zinc sulfates. American Mineralogist: 81: 238-243.
Internet Links for Namuwite
Localities for Namuwite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Blackjack Mine, Beetown, Upper Mississippi Valley District, Grant Co., Wisconsin, USAFrom Debbie Woolf, 20th Jun 2013 10:11:23