General Chayesite Information
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Chemical Formula: |
K(Mg,Fe++)4Fe+++(Si12O30) |
Composition: |
Molecular Weight = 1,040.72 gm |
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Potassium 3.76 % K 4.53 % K2O |
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Magnesium 7.01 % Mg 11.62 % MgO |
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Iron 10.73 % Fe 6.90 % FeO / 7.67 % Fe2O3 |
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Silicon 32.38 % Si 69.28 % SiO2 |
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Oxygen 46.12 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
KMg3Fe2+Fe3+Si12O30 |
IMA Status: |
Approved IMA 1989 |
Locality: |
Link to MinDat.org Location Data. |
Synonym: |
ICSD 23369 |
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PDF 45-1472 |
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Chayesite Image |
Images:
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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 |
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Chayesite Crystallography
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Axial Ratios: |
a:c = 1:1.41711 |
Cell Dimensions: |
a = 10.153, c = 14.388, Z = 2; V = 1,284.46 Den(Calc)= 2.69 |
Crystal System: |
Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mcc |
X Ray Diffraction: |
By Intensity(I/Io): 3.24(1), 3.75(1), 5.08(1), |
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]
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Physical Properties of Chayesite
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Cleavage: |
None |
Color: |
Dark blue. |
Diaphaniety: |
Transparent |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Chayesite
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Optical Data: |
Uniaxial (+), w=1.575, e=1.578, bire=0.0030. |
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Calculated Properties of Chayesite
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Electron Density: |
relectron=2.66 gm/cc note: rChayesite =2.69 gm/cc. |
Fermion Index |
Fermion Index = 0.02463 Boson Index = 0.97537 |
Photoelectric: |
PEChayesite = 4.94 barns/electron U=PEChayesite x relectron= 13.14 barns/cc. |
Radioactivity: |
GRapi = 53.63 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Chayesite - barely detectable
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Chayesite Classification
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Dana Class: |
63.2.1a.2 (63)Cyclosilicate Condensed Rings |
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(63.2)Milarite - Osumilite type (6x2) Double Rings |
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(63.2.1a)Milarite - Osumilite group (Milarite - Osumilite subgroup) |
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63.2.1a.1 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.2 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m |
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63.2.1a.3 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m |
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63.2.1a.4 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.5 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m |
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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 |
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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 |
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63.2.1a.8 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.9 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m |
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63.2.1a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.12 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m |
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63.2.1a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m |
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63.2.1a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m |
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63.2.1a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m |
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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 |
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63.2.1a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m |
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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 |
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63.2.1a.19 IMA2003-045a! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m |
Strunz Class: |
VIII/E.22-50 VIII - Silicates |
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VIII/E - Cyklosilicates, double six rings [Si12O30]12- |
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VIII/E.22 - Millarite - Osumilite series |
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VIII/E.22-10 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-20 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m |
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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 |
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VIII/E.22-25 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-30 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-40 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m |
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VIII/E.22-50 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-60 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-70 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m |
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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 |
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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 |
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VIII/E.22-100 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m |
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VIII/E.22-110 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-120 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m |
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VIII/E.22-125 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-130 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m |
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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 |
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VIII/E.22-135 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-140 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-150 Armenite BaCa2Al6Si9O30·2(H2O) Pnc2 mm2 |
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Other Chayesite Information
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References: |
PHYS. PROP.(Am.Min.,Vol.74,p1368-1373,1989) OPTIC PROP.(Am.Min.,Vol.74,p1368-1373,1989) |
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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