Chayesite Mineral Data

General Chayesite Information
Help on Chemical Formula: Chemical Formula: K(Mg,Fe++)4Fe+++(Si12O30)
Help on Composition: Composition: Molecular Weight = 1,040.72 gm
   Potassium   3.76 %  K     4.53 % K2O
   Magnesium   7.01 %  Mg   11.62 % MgO
   Iron       10.73 %  Fe    6.90 % FeO /  7.67 % Fe2O3
   Silicon    32.38 %  Si   69.28 % SiO2
   Oxygen     46.12 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KMg3Fe2+Fe3+Si12O30
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Synonym: Synonym: ICSD 23369
  PDF 45-1472
 

Chayesite Image

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Chayesite

Comments: Crystalline aggregate of rusty red, thin tabular hexagonal plates of chayesite stacked along the c-axis on matrix.
Location: Pauliberg Mt., Kobersdorf, Oberpullendorf, Burgenland, Austria. Scale: Crystal size 0.5 mm.
© Tom Loomis / Dakota Matrix

Chayesite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.41711
Help on Cell Dimensions: Cell Dimensions: a = 10.153, c = 14.388, Z = 2; V = 1,284.46 Den(Calc)= 2.69
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mcc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.24(1), 3.75(1), 5.08(1),
Click Here for Large Chayesite Structure Window Crystal Structure:

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Alietti E , Brigatti M F , Capedri S , Poppi L , Mineralogical Magazine , 58 (1994) p.655-662, The roedderite-chayesite series from Spanish lamproites:, crystal chemical characterization, Locality: Cancarix, Albacete province, Spain

View Additional jPOWD Structure files for Chayesite
[1] [2] [3]
 

Physical Properties of Chayesite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark blue.
Help on Diaphaniety: Diaphaniety: Transparent
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Chayesite

Help on Optical Data: Optical Data: Uniaxial (+), w=1.575, e=1.578, bire=0.0030.
 

Calculated Properties of Chayesite

Help on Electron Density: Electron Density:

relectron=2.66 gm/cc
note: rChayesite =2.69 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.02463
Boson Index = 0.97537
Help on Photoelectric: Photoelectric:

PEChayesite = 4.94 barns/electron
U=PEChayesite x relectron= 13.14 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 53.63 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Chayesite - barely detectable

 

Chayesite Classification
Help on Dana Class: Dana Class: 63.2.1a.2 (63)Cyclosilicate Condensed Rings
  (63.2)Milarite - Osumilite type (6x2) Double Rings
  (63.2.1a)Milarite - Osumilite group (Milarite - Osumilite subgroup)
 
63.2.1a.1 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.2 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m
 
63.2.1a.3 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m
 
63.2.1a.4 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.5 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.6 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.7 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.8 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.9 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m
 
63.2.1a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.12 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m
 
63.2.1a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m
 
63.2.1a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m
 
63.2.1a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m
 
63.2.1a.16 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m
 
63.2.1a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m
 
63.2.1a.18 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m
 
63.2.1a.19 IMA2003-045a! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/E.22-50 VIII - Silicates
  VIII/E - Cyklosilicates, double six rings [Si12O30]12-
  VIII/E.22 - Millarite - Osumilite series
 
VIII/E.22-10 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-20 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-22 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-25 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-30 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-40 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m
 
VIII/E.22-50 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-60 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-70 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m
 
VIII/E.22-80 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-90 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-100 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m
 
VIII/E.22-110 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-120 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m
 
VIII/E.22-125 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-130 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-133 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-135 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-140 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-150 Armenite BaCa2Al6Si9O30·2(H2O) Pnc2 mm2
 

Other Chayesite Information
Help on References: References: PHYS. PROP.(Am.Min.,Vol.74,p1368-1373,1989) OPTIC PROP.(Am.Min.,Vol.74,p1368-1373,1989)
Help on See Also: See Also: Links to other databases for Chayesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Chayesite

K(Mg,Fe++)4Fe+++(Si12O30)
Dana No: 63.2.1a.2 Strunz No: VIII/E.22-50
Locality:

 

Notes:

 
 
   
 
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