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Warikahnite

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Formula:
Zn
 
3
(AsO
 
4
)
 
2
· 2H
 
2
O
System:TriclinicColour: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:40.3.1.1

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

Lustre:Vitreous, Waxy
Diaphaneity (Transparency):Transparent
Colour:Colourless to light yellow

Crystallography of Warikahnite

Crystal System:Triclinic
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 ų (Calculated from Unit Cell)

Optical Data of Warikahnite

Type:Biaxial (+)
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.
Surface Relief:High
Dispersion:r > v

Chemical Properties of Warikahnite

Formula:
Zn
 
3
(AsO
 
4
)
 
2
· 2H
 
2
O
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):

- +
8.CA.05Fransoletite
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
· 4H
 
2
O
8.CA.05Parafransoletite
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
· 4H
 
2
O
8.CA.10Ehrleite
Ca
 
4
Be
 
3
Zn
 
2
(PO
 
4
)
 
6
· 9H
 
2
O
8.CA.15Faheyite
(Mn,Mg,Na)Be
 
2
Fe
 
2
(PO
 
4
)
 
4
· 6H
 
2
O
8.CA.20Gainesite
Na(Na,K)(Be,Li)Zr
 
2
(PO
 
4
)
 
4
· 1.5-2H
 
2
O
8.CA.20Mccrillisite
NaCs(Be,Li)Zr
 
2
(PO
 
4
)
 
4
· 1-2H
 
2
O
8.CA.20Selwynite
NaK(Be,Al)Zr
 
2
(PO
 
4
)
 
4
· 2H
 
2
O
8.CA.25Pahasapaite
Li
 
8
(Ca,Li,K)
 
10.5
Be
 
24
(PO
 
4
)
 
24
· 38H
 
2
O
8.CA.30Hopeite
Zn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
8.CA.30Arsenohopeite
Zn
 
3
(AsO
 
4
)
 
2
· 4H
 
2
O
8.CA.40Phosphophyllite
Zn
 
2
Fe(PO
 
4
)
 
2
· 4H
 
2
O
8.CA.45Parascholzite
CaZn
 
2
(PO
 
4
)
 
2
· 2H
 
2
O
8.CA.45Scholzite
CaZn
 
2
(PO
 
4
)
 
2
· 2H
 
2
O
8.CA.50Keyite
Cu
2+
3
Zn
 
4
Cd
 
2
(AsO
 
4
)
 
6
· 2H
 
2
O
8.CA.55Pushcharovskite
K
 
0.6
Cu
 
18
(AsO
 
4
)(HAsO
 
4
)
 
10
(H
 
2
AsO
 
4
)
 
4
(OH)
 
9.6
·18.6H
 
2
O
8.CA.60Prosperite
CaZn
 
2
(AsO
 
4
)(HAsO
 
4
)(OH)
8.CA.65Gengenbachite
KFe
3+
3
(HPO
 
4
)
 
4
(H
 
2
PO
 
4
)
 
2
· 6H
 
2
O
8.CA.70Parahopeite
Zn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.3.1Adamite
Zn
 
2
(AsO
 
4
)(OH)
20.3.2Paradamite
Zn
 
2
(AsO
 
4
)(OH)
20.3.3Koritnigite
Zn(HAsO
 
4
) · H
 
2
O
20.3.4Legrandite
Zn
 
2
(AsO
 
4
)(OH) · H
 
2
O
20.3.6Köttigite
Zn
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
20.3.7Stranskiite
Zn
 
2
Cu(AsO
 
4
)
 
2
20.3.8Philipsburgite
(Cu,Zn)
 
6
(AsO
 
4
,PO
 
4
)
 
2
(OH)
 
6
· H
 
2
O
20.3.9Austinite
CaZn(AsO
 
4
)(OH)
20.3.10Prosperite
CaZn
 
2
(AsO
 
4
)(HAsO
 
4
)(OH)
20.3.11Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
20.3.12Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
20.3.13O'Danielite
Na(Zn,Mg)
 
3
H
 
2
(AsO
 
4
)
 
3
20.3.14Johillerite
Na(Mg,Zn)
 
3
Cu(AsO
 
4
)
 
3
20.3.15Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
(AsO
 
4
)
 
2
(SiO
 
4
)(OH)
 
8
20.3.16Chudobaite
(Mg,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
20.3.17Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.3.18Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
20.3.19Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
· 8(H
 
2
O,OH)
20.3.20Ojuelaite
ZnFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
20.3.21Fahleite
Zn
 
5
CaFe
 
2
(AsO
 
4
)
 
6
· 14H
 
2
O
20.3.22Keyite
Cu
2+
3
Zn
 
4
Cd
 
2
(AsO
 
4
)
 
6
· 2H
 
2
O

Other Names for Warikahnite

Synonyms:
IMA1978-038
Other Languages:
German:Warikahnit
Russian:Вариканит
Spanish:Warikahnita

Other Information

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

Reference List:

- +
Neues Jahrbuch für Mineralogie, Monatshefte (1979), 389-395.

American Mineralogist (1980): 65: 408.

Internet Links for Warikahnite

Search Engines:
  • Look for Warikahnite on Google
  • Look for Warikahnite images on Google
  • External Links:
  • Look for Warikahnite on Webmineral
  • Look for Warikahnite on Athena Mineralogy
  • Look for Warikahnite on Wikipedia
  • Look for Warikahnite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Warikahnite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • The Arkenstone - Fine Minerals
  • rare and unusual minerals mainly crystallized
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • High-end worldwide specimens & outstanding customer service
  • SpiriferMinerals.com - high quality low prices
  • Buy RARE Minerals from Rocks of Africa
  • Fine Minerals from Weinrich Minerals, Inc.
  • Buy fine minerals and gemstones from Pala International
  • Find Warikahnite on www.crystalclassics.co.uk
  • Buy from David K Joyce minerals
  • Rare and Unusual minerals at Mineralogical Research Company
  • Fine minerals from bisbeeborn.com
  • 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.
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
            • Kamariza Mines (Kamareza Mines)
    No reference listed
    Lapis No.7/8 1999 p.70-74
          • Plaka
            • Plaka Mines
    Min Rec 36:4 p 315
    Namibia
     
    • Otjikoto Region (Oshikoto)
      • Tsumeb
    Min Rec 36:4 p 315
    Mineral and/or Locality  
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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