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Chayesite

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Formula:
K(Mg,Fe)4FeSi12O30
System:
Hexagonal
Colour:
Blue, brown, red
Hardness:
5 - 6
Name:
For Dr. Felix Chayes, Carnegie Institution's Geophysical Laboratory, Washington D. C.

Classification of Chayesite

Approved 1987
9.CM.05

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

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
14.24.6

14 : Silicates not Containing Aluminum
24 : Silicates of Fe, Mg and alkalis
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http://www.mindat.org/min-974.html
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Type Occurrence of Chayesite

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:

Physical Properties of Chayesite

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

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
Max Birefringence:
δ = 0.003
Image 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)4FeSi12O30
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Mn,Na,K

Relationship of Chayesite to other Species

9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2O
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
9.CM.05DarapiositeKNa2(Zn,Li)3(Mn,Zr)2[Si12O30]
9.CM.05EifeliteKNa3Mg4Si12O30
9.CM.05Merrihueite(K,Na)2(Fe,Mg)5Si12O30
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2O
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30
9.CM.05Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
9.CM.05PoudretteiteKNa2B3Si12O30
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
9.CM.05SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]
14.24.1Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
14.24.2Magnesio-arfvedsonite{Na}{Na2}{Mg4Fe3+}(Si8O22)(OH)2
14.24.3CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
14.24.4Roedderite(Na,K)2(Mg,Fe)5Si12O30
14.24.5Merrihueite(K,Na)2(Fe,Mg)5Si12O30

Other Names for Chayesite

Name in Other Languages:
German:Chayesit
Spanish:Chayesita

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 Chayesite

Reference List:
American Mineralogist: 74: 1368-1373.

Mineralogical Magazine: 58: 655-662.

Internet Links for Chayesite

Localities for Chayesite

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.
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 (TL)
 
  • Utah
    • Summit Co.
      • Woodland
AM 74 (1989), 1368; HB2/1 (1995); Mitt. Abt. Miner. Landesmuseum Joanneum 60/61 (1996), 77
Mineral and/or Locality  
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