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Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia
© Brent Thorne 2007
|System:||Triclinic||Colour:||Colourless to light ...|
|Name:||Named after Walter Richard Kahn, a financial supporter of research on secondary minerals and their crystal structures.|
Note: Some "warikahnites" (yellow prisms associated with Cu-bearing adamite and olivenite sprays) recently (late 1980s and later) sold turned out to be willemites. This material is similar to that shown in http://www.mindat.org/photo-174225.html and http://www.mindat.org/photo-372025.html .
Classification of Warikahnite
|IMA status:||Approved 1978|
|Strunz 8th edition ID:||7/C.07-40|
|Nickel-Strunz 10th (pending) edition ID:||8.CA.35|
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
|Dana 8th edition ID:||220.127.116.11|
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
|Hey's CIM Ref.:||20.3.5|
20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg
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Type Occurrence of Warikahnite
|Type Locality:||Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia|
|Year of Discovery:||1978|
Physical Properties of Warikahnite
|Colour:||Colourless to light yellow|
Crystallography of Warikahnite
|Cell Parameters:||a = 6.71Å, b = 8.98Å, c = 14.53Å|
α = 105.59°, β = 93.44°, γ = 108.68°
|Ratio:||a:b:c = 0.747 : 1 : 1.618|
|Unit Cell Volume:||V 788.58 Å³ (Calculated from Unit Cell)|
Optical Data of Warikahnite
|RI values:||nα = 1.747 nβ = 1.753 nγ = 1.768|
|2V:||Measured: 75° , Calculated: 66°|
|Maximum Birefringence:||δ = 0.021|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v|
Chemical Properties of Warikahnite
|Simplified for copy/paste:||Zn3(AsO4)2·2H2O|
|Essential elements:||As, H, O, Zn|
|All elements listed in formula:||As, H, O, Zn|
Relationship of Warikahnite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Warikahnite
|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 Warikahnite
Neues Jahrbuch für Mineralogie, Monatshefte (1979), 389-395.
American Mineralogist (1980): 65: 408.
Internet Links for Warikahnite
|Specimens:||The following Warikahnite specimens are currently listed for sale on minfind.com.|
Localities for Warikahnite
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.