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Keyite

Big Photo

Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© Christian Rewitzer

Show Keyite Photos (3)
Formula:
(Cu,Zn,Cd)
 
3
(AsO
 
4
)
 
2
System:Monoclinic
Name:For prominent US mineral dealer, Charles Locke Key (b.1935).
This page provides mineralogical data about Keyite.

Classification of Keyite

IMA status:Approved 1975
Strunz 8th edition ID:7/C.30-20
Nickel-Strunz 10th (pending) edition ID:8.CA.50

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
Dana 8th edition ID:38.3.8.1

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2
Hey's CIM Ref.:20.3.22

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

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Year of Discovery:1977

Crystallography of Keyite

Crystal System:Monoclinic
Cell Parameters:a = 11.65Å, b = 12.68Å, c = 6.87Å
β = 98.95°
Ratio:a:b:c = 0.919 : 1 : 0.542
Unit Cell Volume:V 1,002.49 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Keyite

Type:Biaxial
RI values: nα = 1.800 nγ = 1.870
Maximum Birefringence:δ = 0.070

Chart 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:
(Cu,Zn,Cd)
 
3
(AsO
 
4
)
 
2
Essential elements:As, Cu, O
All elements listed in formula:As, Cd, Cu, O, Zn

Relationship of Keyite to other Species

Related Minerals - Nickel-Strunz Grouping):
8.CA.05Fransoletite
Ca
 
3
Be
 
2
[HPO
 
4
|PO
 
4
]
 
2
 · 4H
 
2
O
8.CA.05Parafransoletite
Ca
 
3
Be
 
2
[HPO
 
4
|PO
 
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.30Parahopeite
Zn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CA.35Warikahnite
Zn
 
3
(AsO
 
4
)
 
2
·2H
 
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.55Pushcharovskite
CuAsO
 
3
OH·H
 
2
O
8.CA.60Prosperite
CaZn
 
2
[OH|HAsO
 
4
|AsO
 
4
]
8.CA.65Gengenbachite
KFe
3+
3
[H
 
2
PO
 
4
|(HPO
 
4
)
 
2
]
 
2
 · 6H
 
2
O
Related Minerals - Hey's Index Grouping:
20.3.1Adamite
Zn
 
2
(AsO
 
4
)(OH)
20.3.2Paradamite
Zn
 
2
[OH|AsO
 
4
]
20.3.3Koritnigite
Zn[HAsO
 
4
] · H
 
2
O
20.3.4Legrandite
Zn
 
2
[OH|AsO
 
4
] · H
 
2
O
20.3.5Warikahnite
Zn
 
3
(AsO
 
4
)
 
2
·2H
 
2
O
20.3.6Köttigite
Zn
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
20.3.7Stranskiite
(Zn,Cu)
 
3
[AsO
 
4
]
 
2
20.3.8Philipsburgite
(Cu,Zn)
 
6
[(OH)
 
3
|(AsO
 
4
,PO
 
4
)]
 
2
 · H
 
2
O
20.3.9Austinite
CaZn[OH|AsO
 
4
]
20.3.10Prosperite
CaZn
 
2
[OH|HAsO
 
4
|AsO
 
4
]
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
[(OH)
 
8
|(AsO
 
4
)
 
2
|SiO
 
4
]
20.3.16Chudobaite
(Na,K)(Mg,Zn)
 
2
H(AsO
 
4
)(OH,O)
 
6
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

Other Names for Keyite

Synonyms:
IMA1975-002
German names:
Keyit
Russian names:
Кейит
Spanish names:
Keyita

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 Keyite

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

Canadian Mineralogist (1996): 34: 623-630.

Internet Links for Keyite

Search Engines:
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    • External Links:
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  • Look for Keyite on Wikipedia
  • Look for Keyite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Keyite in the Natural History Museum (London) online catalogue
  • Keyite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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  • Lapis Mineral Magazin
  • Buy fine minerals and gemstones from Pala International
  • Buy from David K Joyce minerals
  • Find Keyite on www.crystalclassics.co.uk
  • Buy Minerals and Crystals from Crystalarium.com
  • Rare and Unusual minerals at Mineralogical Research Company
  • Fine Minerals from Dan Weinrich Minerals
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    Localities for Keyite

    Hide Locality List
    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.
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    (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 (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Lavrion (Laurion; Laurium)
            • Lavrion Mines
    		No reference listed
    No reference listed
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Min.Rec.(1977) 62, 59 and 87-90; Rocks & Min.: 62:440.
    Mineral and/or Locality
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