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Keyite

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Formula:
Cu32+Zn4Cd2(AsO4)6 · 2H2O
System:
Monoclinic
Colour:
blue
Name:
For prominent US mineral dealer, Charles Locke Key (b. 1935).
Isostructural with:
The Cd-dominant analogue of erikapohlite.


Classification of Keyite

Approved
Approval Year:
1975
8.CA.50

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
40.2.18.

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
20.3.22

20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg

Physical Properties of Keyite

Colour:
blue
Density:
5.106 g/cm3 (Measured)    

Optical Data of Keyite

Type:
Biaxial
RI values:
nα = 1.800 nγ = 1.870
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v

Chemical Properties of Keyite

Formula:
Cu32+Zn4Cd2(AsO4)6 · 2H2O
Elements listed in formula:

Crystallography of Keyite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 11.654(3) Å, b = 12.780(5) Å, c = 6.840(3) Å
β = 99.11°
Ratio:
a:b:c = 0.912 : 1 : 0.535
Unit Cell Volume:
V 1005.8 ų
Z:
2
Comment:
space group I2/a
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of Keyite

Relationship of Keyite to other Species

Other Members of Group:
Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Alluaudite-Ca□4Ca4Mn42+Fe83+(PO4)12
Alluaudite-Na□4Na4Mn42+Fe83+(PO4)12
Arseniopleite(Ca,Na)NaMn2+(Mn2+,Mg,Fe2+)2(AsO4)3
BadaloviteNa2Mg2Fe(AsO4)3
BradaczekiteNaCu4(AsO4)3
CalciojohilleriteNaCaMg3(AsO4)3
CanutiteNaMn3[AsO4][AsO3(OH)]2
Caryinite(Na,Pb)(Ca,Na)CaMn22+(AsO4)3
ErikapohliteCu3(Zn,Cu,Mg)4Ca2(AsO4)6·2H2O
Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
Ferroalluaudite-NaNaNa4Na4Fe42+Fe83+(PO4)12
FerrohagendorfiteNaCaFe2+Fe22+(PO4)3
GroatiteNaCaMn2(PO4)(HPO4)2
HagendorfiteNaCaMn2+Fe22+(PO4)3
Hagendorfite-(Na)(Na)Fe2+Mn2+(PO4)-(Na)(Na)
HatertiteNa2(Ca,Na)(Fe3+,Cu)2(AsO4)3
JohilleriteNa(Mg,Zn)3Cu(AsO4)3
Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3
MagnesiocanutiteNaMnMg2[AsO4]2[AsO2(OH)2]
Magnesiohatertite(Na,Ca)2Ca(Mg,Fe3+)2(AsO4)3
ManitobaiteNa16Mn2+ 25Al8(PO4)30
NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3
O'DanieliteNa(Zn,Mg)3H2(AsO4)3
VaruliteNaCaMn2+Mn22+(PO4)3
YazganiteNaFe23+(Mg,Mn2+)(AsO4)3 · H2O
ZhanghuifeniteNa3Mn4Mg2Al(PO4)6
ZincobradaczekiteNaZn2Cu2(AsO4)3
8.CA.ApexiteNaMg(PO4)·9H2O
8.CA.05FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.05ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2O
8.CA.15FaheyiteBe2Mn2+Fe23+(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.35WarikahniteZn3(AsO4)2 · 2H2O
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2O
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2O
8.CA.45ScholziteCaZn2(PO4)2 · 2H2O
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2O
8.CA.60ProsperiteCa2Zn4(AsO4)4•H2O ·
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
20.3.5WarikahniteZn3(AsO4)2 · 2H2O
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)
20.3.10ProsperiteCa2Zn4(AsO4)4•H2O ·
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
20.3.21FahleiteCaZn5Fe23+(AsO4)6 · 14H2O

Other Names for Keyite

Name in Other Languages:
German:Keyit
Russian:Кейит
Spanish:Keyita

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 Keyite

Reference List:
American Mineralogist (1977) 62: 1259.

Canadian Mineralogist (1996) 34: 623-630.

Malcherek, T. & Jochen Schlüter, J. (2013): The keyite crystal structure, revisited. Zeitschrift für Kristallographie - Crystalline Materials 228, 620-628.

Internet Links for Keyite

mindat.org URL:
https://www.mindat.org/min-2191.html
Please feel free to link to this page.
Specimens:
The following Keyite specimens are currently listed for sale on minfind.com.

Localities for Keyite

This 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
        • Lavrion (Laurion; Laurium)
No reference listed
Rieck, B: Seltene Arsenate aus der Kamariza und weitere Neufunde. LAPIS 24 (1999) 7/8, 68-76 (in German)
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Min.Rec.(1977) 62, 59 and 87-90; Rocks & Min.: 62:440.
Mineral and/or Locality  
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