General Osumilite-(Mg) Information
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Chemical Formula: |
(K,Na)(Mg,Fe++)2(Al,Fe+++)3(Si,Al)12O30 |
Composition: |
Molecular Weight = 1,015.74 gm |
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Potassium 2.89 % K 3.48 % K2O |
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Sodium 0.57 % Na 0.76 % Na2O |
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Magnesium 3.59 % Mg 5.95 % MgO |
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Aluminum 13.95 % Al 26.35 % Al2O3 |
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Iron 6.87 % Fe 3.54 % FeO / 5.90 % Fe2O3 |
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Silicon 24.89 % Si 53.24 % SiO2 |
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Oxygen 47.25 % O |
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______ ______ |
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100.00 % 99.21 % = TOTAL OXIDE |
Empirical Formula: |
K0.75Na0.25Mg1.5Fe2+0.5Al2.25Fe3+0.75Si9Al3O30 |
IMA Status: |
Approved IMA 1983 |
Locality: |
Historic province of Osumi in Sakkabira, Kyushu, Japan. Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality and the composition. |
Synonym: |
ICSD 202731 |
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PDF 30-942 |
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Search for Osumilite-(Mg) Images |
Images:
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Osumilite-(Mg) Crystallography
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Axial Ratios: |
a:c = 1:1.40901 |
Cell Dimensions: |
a = 10.117, c = 14.255, Z = 2; V = 1,263.58 Den(Calc)= 2.67 |
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): 3.22(1), 4.11(0.6), 5.01(0.6), |
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Physical Properties of Osumilite-(Mg)
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Cleavage: |
None |
Color: |
Brown, Green, Dark blue, Black. |
Density: |
2.62 - 2.64, Average = 2.63 |
Diaphaniety: |
Translucent to Opaque |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luster: |
Vitreous (Glassy) |
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Optical Properties of Osumilite-(Mg)
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Gladstone-Dale: |
CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2029,KPDmeas= 0.206,KC= 0.204 |
Optical Data: |
Uniaxial (+), w=1.5406, e=1.543, bire=0.0024. |
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Calculated Properties of Osumilite-(Mg)
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Electron Density: |
relectron=2.64 gm/cc note: rOsumilite-(Mg) =2.67 gm/cc. |
Fermion Index |
Fermion Index = 0.01689 Boson Index = 0.98311 |
Photoelectric: |
PEOsumilite-(Mg) = 3.77 barns/electron U=PEOsumilite-(Mg) x relectron= 9.95 barns/cc. |
Radioactivity: |
GRapi = 41.16 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Osumilite-(Mg) - barely detectable
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Osumilite-(Mg) Classification
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Dana Class: |
63.2.1a.7 (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.22-80 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 Osumilite-(Mg) Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Osumilite-(Mg) :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -Handbook of Mineralogy (MinSocAm)
6 -MinDAT
7 -MinMax(Deutsch)
8 -MinMax(English)
9 -Mineralienatlas (Deutsch)
10 -QUT Mineral Atlas
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Osumilite-(Mg)
(K,Na)(Mg,Fe++)2(Al,Fe+++)3(Si,Al)12O30
Dana No: 63.2.1a.7 Strunz No: VIII/E.22-80
Locality:
Notes:
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