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Chayesite

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Formula:
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
System:HexagonalColour:Blue, brown, red
Hardness:5 - 6
Name:For Dr. Felix Chayes, Carnegie Institution's Geophysical Laboratory, Washington D. C.

Classification of Chayesite

IMA status:Approved 1987
Strunz 8th edition ID:8/E.22-50
Nickel-Strunz 10th (pending) edition ID:9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th edition ID:63.2.1a.2

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:14.24.6

14 : Silicates not Containing Aluminum
24 : Silicates of Fe, Mg and alkalis
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Type Occurrence of Chayesite

Type Locality:Moon Canyon, Woodland, Summit Co., Utah, USA
General Appearance of Type Material:Laths to 100 microns.
Place of Conservation of Type Material:Smithsonian NMNH 165807
Year of Discovery:1987
Geological Setting of type material:Rock forming mineral in lamproite
Associated Minerals at type locality:
K Feldspar

Physical Properties of Chayesite

Lustre:Vitreous
Colour:Blue, brown, red
Comment:May have oxidised coatings
Hardness (Mohs):5 - 6
Tenacity:Brittle
Cleavage:None Observed
Density (calculated):2.68 g/cm3

Crystallography of Chayesite

Crystal System:Hexagonal
Cell Parameters:a = 10.15Å, c = 14.38Å
Ratio:a:c = 1 : 1.417
Unit Cell Volume:V 1,282.99 ų (Calculated from Unit Cell)

Optical Data of Chayesite

Type:Uniaxial (+)
RI values: nω = 1.575 nε = 1.578
Maximum Birefringence:δ = 0.003

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Pleochroism:Strong
Comments:O= sky blue
E= colorless

Chemical Properties of Chayesite

Formula:
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
Simplified for copy/paste:K(Mg,Fe)4FeSi12O30
Essential elements:Fe, K, Mg, O, Si
All elements listed in formula:Fe, K, Mg, O, Si
Common Impurities:Ti,Al,Mn,Na,K

Relationship of Chayesite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.CM.05Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
· 2H
 
2
O
9.CM.05Brannockite
(K,Na)□
 
2
Li
 
3
(Sn,Zr,Ti)
 
2
[Si
 
12
O
 
30
]
9.CM.05Darapiosite
KNa
 
2
(Zn,Li)
 
3
(Mn,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Eifelite
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
9.CM.05Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
9.CM.05Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
· H
 
2
O
9.CM.05Osumilite-(Mg)
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
9.CM.05Osumilite
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
9.CM.05Poudretteite
KNa
 
2
B
 
3
Si
 
12
O
 
30
9.CM.05Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
9.CM.05Sogdianite
K(□,Na)
 
2
Li
 
3
(Zr,Fe,Ti)
 
2
[Si
 
12
O
 
30
]
9.CM.05Sugilite
K(Na,□)
 
2
Li
 
3
(Fe,Mn,Al,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
9.CM.05Berezanskite
K□
 
2
Li
 
3
(Ti,Zr,Sn)
 
2
[Si
 
12
O
 
30
]
9.CM.05Dusmatovite
K(Na,□)
 
2
(Zn,Li)
 
3
(Mn
2+
 
,Y,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Shibkovite
K(□,K,Na)
 
2
Zn
 
3
Ca
 
2
[Si
 
12
O
 
30
]
9.CM.05Almarudite
K(□,Na)
 
2
(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
9.CM.05Trattnerite
□(Fe
3+
 
,Mg,Fe
2+
 
)
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
3
(Si
 
12
O
 
30
)
9.CM.05Oftedalite
(Sc,Ca,Mn
2+
 
)
 
2
K[(Be,Al)
 
3
Si
 
12
O
 
30
]
9.CM.10Faizievite
K
 
2
Na(Ca
 
6
Na)Ti
 
4
Li
 
6
[F
 
2
|Si
 
24
O
 
66
]
Related Minerals - Hey's Index Grouping:

- +
14.24.1Magnesio-riebeckite
◻{Na
 
2
}{Mg
 
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2
14.24.2Magnesio-arfvedsonite
{Na}{Na
 
2
}{Mg
 
4
Fe
3+
 
}(Si
 
8
O
 
22
)(OH)
 
2
14.24.3Celadonite
K(Mg,Fe
2+
 
)Fe
3+
 
(Si
 
4
O
 
10
)(OH)
 
2
14.24.4Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
14.24.5Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30

Other Names for Chayesite

Synonyms:
IMA1987-059
Other Languages:
German:Chayesit
Russian:Чейесит
Spanish:Chayesita

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 Chayesite

Reference List:

- +
American Mineralogist: 74: 1368-1373.

Mineralogical Magazine: 58: 655-662.

Internet Links for Chayesite

Search Engines:
  • Look for Chayesite on Google
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  • External Links:
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  • Look for Chayesite on Athena Mineralogy
  • Look for Chayesite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chayesite details from Handbook of Mineralogy (PDF)
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  • Localities for Chayesite

    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.
    Austria
     
    • Burgenland
      • Oberpullendorf
        • Kobersdorf
          • Pauliberg
    O Dziallas collection; U. Kolitsch, W. Postl, H.-P. Bojar and W. Trattner (2009): Die Mineralvorkommen im Basalt des Pauliberges. In: Autorenkollektiv (Red. M. A. Götzinger und P. Huber) (2009): Die Mineralien des Burgenlandes - Geologie, Mineralogie und mineralische Rohstoffe. – Wissenschaftliche Arbeiten aus dem Burgenland, Band 126, Amt der Burgenländischen Landesregierung, Abteilung 7 - Landesmuseum, Eisenstadt, 83-99.
    France
     
    • Auvergne
      • Haute-Loire
        • Le Puy-en-Velay
          • Espaly-Saint-Marcel
    Médard E, Médard P, Pourtier G (2012) La chayesite, un autre mineral du groupe de l'osumilite à la Denise. Le Cahier des Micromonteurs 115: 22-23.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Mayen
          • Ettringen
            • Bellerberg volcano
    Christof Schäfer collection
    Spain
     
    • Castile-La Mancha
      • Albacete
        • Hellín
          • Cancarix
    Lapis 2003(1), 8 Am Min 74:1368-1373
    USA
     
    • Utah
      • Summit Co.
        • Woodland
    AM 74 (1989), 1368; HB2/1 (1995); Mitt. Abt. Miner. Landesmuseum Joanneum 60/61 (1996), 77
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