Osumilite-(Fe) Mineral Data

Osumilite-(Fe) Mineral Data +

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General Osumilite-(Fe) Information

Chemical Formula:

(K,Na)(Fe++,Mg)2(Al,Fe+++)3(Si,Al)12O30

Composition:

Molecular Weight = 1,047.28 gm

Potassium 2.80 % K 3.37 % K₂O

Sodium 0.55 % Na 0.74 % Na₂O

Magnesium 1.16 % Mg 1.92 % MgO

Aluminum 13.53 % Al 25.56 % Al₂O₃

Iron 12.00 % Fe 10.29 % FeO / 5.72 % Fe₂O₃

Silicon 24.14 % Si 51.63 % SiO₂

Oxygen 45.83 % O

______ ______

100.00 % 99.24 % = TOTAL OXIDE

Empirical Formula:

K_0.75Na_0.25Fe²⁺_1.5Mg_0.5Al_2.25Fe³⁺_0.75Si₉Al₃O₃₀

Environment:

Acidic volcanic rocks.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Historic province of Osumi in Sakkabira, Kyushu, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 202733

Osumilite

PDF 25-628

Osumilite-(Fe) Image

Images:

Osumilite-(Fe)

Comments: Dark blue crystals of osumilite-(Fe) in matrix.
Location: Cava Fontana, Monte Arci, Cagliari, Sardinia, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Osumilite-(Fe) Crystallography

Axial Ratios:

a:c = 1:1.40659

Cell Dimensions:

a = 10.155, c = 14.284, Z = 2; V = 1,275.68 Den(Calc)= 2.73

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/I_o): 3.24(1), 5.08(0.8), 7.17(0.8),

Physical Properties of Osumilite-(Fe)

Color:

Blue, Black, Light blue.

Density:

2.64

Diaphaniety:

Translucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Osumilite-(Fe)

Dichroism (e):

light blue.

Dichroism (w):

colorless.

Optical Data:

Uniaxial (+), w=1.545-1.547, e=1.549-1.551, bire=0.0040.

Calculated Properties of Osumilite-(Fe)

Electron Density:

r_electron=2.69 gm/cc
note: r_{Osumilite-(Fe)}=2.73 gm/cc.

Fermion Index

Fermion Index = 0.01519
Boson Index = 0.98481

Photoelectric:

PE_{Osumilite-(Fe)}= 5.19 barns/electron
U=PE_{Osumilite-(Fe)} x r_electron= 13.95 barns/cc.

Radioactivity:

GRapi = 39.77 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Osumilite-(Fe) - barely detectable

Osumilite-(Fe) Classification

Dana Class:

63.2.1a.6 (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

Strunz Class:

VIII/E.22-90 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 Osumilite-(Fe) Information

References:

NAME( Heinrich65) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Osumilite-(Fe) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Osumilite-(Fe) Specimen Label here :

Osumilite-(Fe)

(K,Na)(Fe++,Mg)2(Al,Fe+++)3(Si,Al)12O30
Dana No: 63.2.1a.6 Strunz No: VIII/E.22-90
Locality:

Notes: