Osumilite-(Fe) Mineral Data

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.

Name Pronunciation:

Osumilite-(Fe) + Pronunciation

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 Dipyramidal H-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

Diaphaneity:

Translucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Osumilite-(Fe)

Dichroism (e):

light blue.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2007,KPDmeas= 0.2076,KC= 0.2095
Ncalc = 1.55 - 1.57

Optical Data:

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

Calculated Properties of Osumilite-(Fe)

Electron Density:

Bulk Density (Electron Density)=2.60 gm/cc
note: Specific Gravity of Osumilite-(Fe) =2.64 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Osumilite-(Fe)}= 5.19 barns/electron
U=PE_{Osumilite-(Fe)} x r_electron= 13.49 barns/cc.

Radioactivity:

GRapi = 39.77 (Gamma Ray American Petroleum Institute Units)
Concentration of Osumilite-(Fe) per GRapi unit = 2.51 (%)

Estimated Radioactivity from Osumilite-(Fe) - barely detectable

Osumilite-(Fe) Classification

Dana Class:

63.02.01a.06 (63)Cyclosilicate Condensed Rings

(63.02)6-membered rings

(63.02.01a)Milarite - Osumilite group (Milarite - Osumilite subgroup)

63.02.01a.01 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.02 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

63.02.01a.03 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

63.02.01a.04 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.05 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.06 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.07 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.08 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.09 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

63.02.01a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.12 Milarite K2Ca4Al2Be4Si24O60•(H2O) P 6/mcc 6/m 2/m 2/m

63.02.01a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

63.02.01a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

63.02.01a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.16 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m

63.02.01a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

63.02.01a.18 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m

63.02.01a.19 Oftedalite! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m

63.02.01a.20 Klochite ([]1Na1)KFe2Zn3[Si12O30] P 6/mcc 6/m 2/m 2/m

63.02.01a.21 Friedrichbeckeite! K([],Na)Mg2(Be2Mg)Si12O30 P 6/mcc 6/m 2/m 2/m

Strunz Class:

09.CM.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CM -[Si6O18]12- 6-membered double rings (sechser-Doppelringe)

09.CM.05 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Armenite BaCa2Al6Si9O30•2(H2O) Pnc2 mm2

09.CM.05 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

09.CM.05 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m

09.CM.05 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

09.CM.05 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

09.CM.05 Milarite K2Ca4Al2Be4Si24O60•(H2O) P 6/mcc 6/m 2/m 2/m

09.CM.05 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

09.CM.05 Oftedalite! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m

09.CM.05 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

09.CM.05 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

09.CM.05 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 63.02.01a.06 Strunz No: 09.CM.05
Locality:

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