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Keyite

A valid IMA mineral species
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About KeyiteHide

09715160015580364594219.jpg
Charles Key in 2011
Formula:
Cu2+3Zn4Cd2(AsO4)6 · 2H2O
Colour:
Deep sky blue, blue
Hardness:
3½ - 4
Specific Gravity:
5.106
Crystal System:
Monoclinic
Name:
Named in honor of Charles Locke Key (b. 1935 - d. 2021), For prominent U.S. mineral dealer, who supplied the mineral for investigation. The mineral ludlockite is also named, in part, after him.
Isostructural with:
The Cd-dominant analogue of erikapohlite.


Unique IdentifiersHide

Mindat ID:
2191
Long-form identifier:
mindat:1:1:2191:9
GUID
(UUID V4):
4db8196e-b312-4716-bb71-5203864822ef

Classification of KeyiteHide

Approved
Approval year:
1975
First published:
1977
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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
KeyIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KeyiteHide

Transparency:
Translucent
Colour:
Deep sky blue, blue
Streak:
Pale blue
Hardness:
3½ - 4 on Mohs scale
Cleavage:
Distinct/Good
{001}
Density:
5.106 g/cm3 (Measured)    4.95 g/cm3 (Calculated)

Optical Data of KeyiteHide

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, strong
Optical Extinction:
Y = b; X ∧ c = 11°, variable with wavelength.

Chemical Properties of KeyiteHide

Formula:
Cu2+3Zn4Cd2(AsO4)6 · 2H2O
IMA Formula:
(◻0.5Cu0.5)CuCdZn2(AsO4)3 · H2O

Crystallography of KeyiteHide

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 V:
1005.8 ų
Z:
2
Morphology:
Prismatic [001] to tabular {010}, commonly tapering or showing sub-parallel stacking on {010}. Dominant forms observed on SEM photos {010), {110}, {210}, {011}, and perhaps {201}.
Twinning:
None observed.
Comment:
space group I2/a

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005498KeyiteCooper M A, Hawthorne F C (1996) The crystal structure of keyite, Cu3(Zn,Cu)4Cd2(AsO4)6(H2O)2, an oxysalt mineral with essential cadmium The Canadian Mineralogist 34 623-63019960293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
2.795 Å(very very strong)
3.29 Å(very strong)
2.876 Å(very strong)
6.41 Å(medium strong)
1.644 Å(medium strong)
3.15 Å(medium)
1.700 Å(medium)
Comments:
Tsumeb, Namibia. Data from the type description.

Geological EnvironmentHide

Type Occurrence of KeyiteHide

General Appearance of Type Material:
Small blue prisms in cavities in tennantite ore.
Place of Conservation of Type Material:
The Natural History Museum, London, England, numbers 1973,236 (holotype), 1975,660.
Harvard University, Cambridge, Massachusetts, USA, number 119917.
Associated Minerals at Type Locality:
Reference:
Embrey, P.G., Fejer, E.E., Clark, A.M. (1977) Keyite: a new mineral from Tsumeb. The Mineralogical Record: 8: 87-90.

Synonyms of KeyiteHide

Other Language Names for KeyiteHide

German:Keyit
Russian:Кейит
Spanish:Keyita

Relationship of Keyite to other SpeciesHide

Other Members of this group:
Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3Mon. 2/m : B2/b
Alluaudite-Ca□4Ca4Mn2+4Fe3+8(PO4)12Mon. 2/m : B2/b
Alluaudite-Na□4Na4Mn2+4Fe3+8(PO4)12Mon. 2/m : B2/b
ArseniopleiteNaCaMnMn2(AsO4)3Mon. 2/m
BadaloviteNa2Mg2Fe(AsO4)3Mon. 2/m : B2/b
BradaczekiteNaCu4(AsO4)3Mon. 2/m : B2/b
CalciohatertiteNaNaCa(CaFe3+)(AsO4)3Mon. 2/m : B2/b
CalciojohilleriteNaCaMg3(AsO4)3Mon. 2/m : B2/b
CamanchacaiteNaCaMg2[AsO4][AsO3(OH)]2Mon. 2/m : B2/b
CanutiteNaMn3[AsO4][AsO3(OH)]2Mon. 2/m : B2/b
Caryinite(Na,Pb)(Ca,Na)CaMn2+2(AsO4)3Mon. 2/m
ErikapohliteCu3(Zn,Cu,Mg)4Ca2(AsO4)6 · 2H2O Mon. 2/m : B2/m
Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3Mon. 2/m : B2/b
Ferroalluaudite-NaNaNa4Na4Fe2+4Fe3+8(PO4)12Mon. 2/m : B2/m
FerrohagendorfiteNaCaFe2+Fe2+2(PO4)3Mon.
GroatiteNaCaMn2(PO4)[PO3(OH)]2Mon. 2/m : B2/b
HagendorfiteNaCaMn2+Fe2+2(PO4)3Mon. 2/m : B2/b
Hagendorfite-NaNaNaNaFe2+(Mn2+,Mn3+)(PO4)3 (?)Mon. 2/m : B2/b
HatertiteNa2(Ca,Na)(Fe3+,Cu)2(AsO4)3Mon. 2/m : B2/b
JohilleriteNa(Mg,Zn)3Cu(AsO4)3Mon. 2/m : B2/b
KhrenoviteNa3Fe3+2(AsO4)3Mon. 2/m : B2/b
Maghagendorfite(Na,◻)MgMn2+(Fe2+,Fe3+)2(PO4)3Mon. 2/m
MagnesiocanutiteNaMnMg2[AsO4]2[AsO2(OH)2]Mon. 2/m : B2/b
Magnesiohatertite(Na,Ca)2Ca(Mg,Fe3+)2(AsO4)3Mon. 2/m : B2/b
NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3Mon. 2/m : B2/b
O'DanieliteNa(Zn,Mg)3(AsO4)(AsO3OH)2Mon. 2/m : B2/b
ParaberzeliiteNaCa2Mg2(AsO4)3Mon. 2/m : B2/b
Unnamed (Na-Mg Arsenate Hydroxyarsenate)NaMg3(AsO4)(AsO3OH)2Mon. 2/m : B2/b
Unnamed (Na-Zn-H Arsenate Hydrxyarsenate)Na(Na0.6Zn0.4)Zn2(H0.6AsO4)(AsO3OH)2Mon. 2/m : B2/b
VaruliteNaCaMn2+Mn2+2(PO4)3Mon. 2/m : B2/b
YazganiteNaFe3+2(Mg,Mn2+)(AsO4)3 · H2OMon. 2/m : B2/b
ZhanghuifeniteNa3Mn4Mg2Al(PO4)6Mon. 2/m
ZincobradaczekiteNaZn2Cu2(AsO4)3Mon. 2/m : B2/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
28 photos of Keyite associated with ZincoliveniteCuZn(AsO4)(OH)
5 photos of Keyite associated with AdamiteZn2(AsO4)(OH)
2 photos of Keyite associated with ChalcociteCu2S
2 photos of Keyite associated with BayldonitePbCu3(AsO4)2(OH)2
2 photos of Keyite associated with SchultenitePb(HAsO4)
1 photo of Keyite associated with Tennantite SubgroupCu6(Cu4C2+2)As4S12S
1 photo of Keyite associated with NiedermayriteCdCu4(SO4)2(OH)6 · 4H2O
1 photo of Keyite associated with ThometzekitePbCu2+2(AsO4)2 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

8.CA.DavidlloyditeZn3(AsO4)2 · 4H2O Tric. 1 : P1
8.CA.ApexiteNaMg(PO4) · 9H2OTric. 1 : P1
8.CA.BrandãoiteBeAl2(PO4)2(OH)2(H2O)5Tric. 1 : P1
8.CA.05FransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2OMon. 2/m : P21/b
8.CA.05ParafransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2OTric. 1 : P1
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2OTric. 1 : P1
8.CA.15FaheyiteBe2Mn2+Fe3+2(PO4)4 · 6H2OTrig. 3 2 : P31 2 1
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.20SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZnZn2(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30NizamoffiteMn2+Zn2(PO4)2(H2O)4Orth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.30Unnamed (Mg-analogue of Hopeite)Mg3(PO4)2 · 4H2O
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric. 1 : P1
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.42SteinmetziteZn2Fe3+(PO4)2(OH) · 3H2OTric. 1 : P1
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2OMon.
8.CA.45ScholziteCaZn2(PO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.55PushcharovskiteK0.6Cu18[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1
8.CA.70ReaphookhilliteMgZn2(PO4)2 · 4H2OTric. 1 : P1
8.CA.75StergiouiteCaZn2(AsO4)2 · 4H2OMon. m : Pb
8.CA.80LimousiniteBaCa[Be4P4O16] · 6H2OMon. 2/m : P21/b
8.CA.85MinjiangiteBaBe2(PO4)2Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
8.CA.85Wilancookite(Ba5Li2◻)Ba6Be24P24O96 · 26H2OIso. 2 3 : I2 3

Fluorescence of KeyiteHide

Not fluorescent.

Other InformationHide

Thermal Behaviour:
Blackens on heating.
Notes:
Soluble in concentrated HCl or HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for KeyiteHide

References for KeyiteHide

Reference List:

Localities for KeyiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion Mining District
          • Km 3
            • Kaminiza mines
            • Km 3 mines
Namibia (TL)
 
  • Oshikoto Region
    • Tsumeb
 
Mineral and/or Locality  
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