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Warikahnite

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Formula:
Zn3(AsO4)2 · 2H2O
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

Approved 1978
8.CA.35

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
40.3.1.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
20.3.5

20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg
mindat.org URL:
http://www.mindat.org/min-4244.html
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Type Occurrence of Warikahnite

Year of Discovery:
1978

Physical Properties of Warikahnite

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

Optical Data of Warikahnite

Type:
Biaxial (+)
RI values:
nα = 1.747 nβ = 1.753 nγ = 1.768
2V:
Measured: 75° , Calculated: 66°
Max Birefringence:
δ = 0.021
Image 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:
Zn3(AsO4)2 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Warikahnite to other Species

8.CA.05FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.05ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2O
8.CA.15Faheyite(Mn,Mg,Na)Be2Fe2(PO4)4 · 6H2O
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
8.CA.20SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2O
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
8.CA.30HopeiteZn3(PO4)2 · 4H2O
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2O
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2O
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2O
8.CA.45ScholziteCaZn2(PO4)2 · 2H2O
8.CA.50KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2O
8.CA.60ProsperiteCaZn2(AsO4)(HAsO4)(OH)
8.CA.65GengenbachiteKFe33+(HPO4)4(H2PO4)2 · 6H2O
8.CA.70ParahopeiteZn3(PO4)2 · 4H2O
20.3.1AdamiteZn2(AsO4)(OH)
20.3.2ParadamiteZn2(AsO4)(OH)
20.3.3KoritnigiteZn(HAsO4) · H2O
20.3.4LegranditeZn2(AsO4)(OH) · H2O
20.3.6KöttigiteZn3(AsO4)2 · 8H2O
20.3.7StranskiiteZn2Cu(AsO4)2
20.3.8Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2O
20.3.9AustiniteCaZn(AsO4)(OH)
20.3.10ProsperiteCaZn2(AsO4)(HAsO4)(OH)
20.3.11GaititeCa2Zn(AsO4)2 · 2H2O
20.3.12ZincroseliteCa2Zn(AsO4)2 · 2H2O
20.3.13O'DanieliteNa(Zn,Mg)3H2(AsO4)3
20.3.14JohilleriteNa(Mg,Zn)3Cu(AsO4)3
20.3.15Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8
20.3.16Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
20.3.17Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6
20.3.18LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
20.3.19Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
20.3.20OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
20.3.21FahleiteZn5CaFe2(AsO4)6 · 14H2O
20.3.22KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O

Other Names for Warikahnite

Name in Other Languages:

Other Information

Health Risks:
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

Specimens:
The following Warikahnite specimens are currently listed for sale on minfind.com.

Localities for Warikahnite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Min Rec 36:4 p 315
Mineral and/or Locality  
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