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Osumilite

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Formula:
(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
System:
Hexagonal
Colour:
Blue
Hardness:
5 - 6
Member of:
Osumilite Group.

Difficult to distinguish from Osumilite-(Mg).

Classification of Osumilite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
63.2.1a.6

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
16.24.16

16 : Silicates Containing Aluminum and other Metals
24 : Aluminosilicates of Fe, Mg, Ca and alkalis
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http://www.mindat.org/min-3039.html
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Type Occurrence of Osumilite

Year of Discovery:
1953

Physical Properties of Osumilite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Blue
Comment:
Strongly pleochroic
Hardness (Mohs):
5 - 6

Crystallography of Osumilite

Crystal System:
Hexagonal
Cell Parameters:
a = 10.15Å, c = 14.25Å
Ratio:
a:c = 1 : 1.404
Unit Cell Volume:
V 1,271.39 ų (Calculated from Unit Cell)

Chemical Properties of Osumilite

Formula:
(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Mn,Ba,K

Relationship of Osumilite to other Species

Member of:
Other Members of Group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
ArmeniteBaCa2Al6Si9O30 · 2H2O
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
DarapiositeKNa2(Zn,Li)3(Mn,Zr)2[Si12O30]
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
EifeliteKNa3Mg4Si12O30
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30
Klöchite(□Na)KFe22+Zn3(Si12O30)
Merrihueite(K,Na)2(Fe,Mg)5Si12O30
MilariteK2Ca4Al2Be4Si24O60 · H2O
Osumilite-(Mg)KMg2Al3(Al2Si10)O30
PoudretteiteKNa2B3Si12O30
Roedderite(Na,K)2(Mg,Fe)5Si12O30
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2O
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30
9.CM.05DarapiositeKNa2(Zn,Li)3(Mn,Zr)2[Si12O30]
9.CM.05EifeliteKNa3Mg4Si12O30
9.CM.05Merrihueite(K,Na)2(Fe,Mg)5Si12O30
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2O
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30
9.CM.05PoudretteiteKNa2B3Si12O30
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
9.CM.05SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]
16.24.1Aegirine-augite(Na,Ca)(Fe3+,Fe2+,Mg,Al)Si2O6
16.24.2Omphacite(Ca,Na)(Mg,Al)Si2O6
16.24.4Ferri-katophoriteNa(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2
16.24.5Ferro-ferri-katophoriteNaCaNaFe42+(Fe3+)[(AlSi7)O22](OH)2
16.24.6Barroisite☐{CaNa}{Mg3Al2}(AlSi7O22)(OH)2
16.24.7Ferri-barroisite☐(CaNa)(Mg3Fe23+)(AlSi7O22)(OH)2
16.24.8Alumino-ferrobarroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
16.24.9Ferro-barroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
16.24.10Ferro-ferri-barroisite☐(CaNa)(Fe32+Fe23+)(AlSi7O22)(OH)2
16.24.11Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
16.24.12Magnesio-hastingsite{Na}{Ca2}{Mg4Fe3+}(Al2Si6O22)(OH)2
16.24.13Taramite Root NameA(CaNa)(Z32+Z23+)(Al2Si6O22)(OH,F,Cl)2
16.24.14Ferri-taramiteNa(CaNa)(Mg3Fe23+)(Al2Si6O22)(OH)2
16.24.15Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2
16.24.16Osumilite-(Mg)KMg2Al3(Al2Si10)O30

Other Names for Osumilite

Name in Other Languages:
Japanese:大隅石
Simplified Chinese:大隅石
Spanish:Osumilita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Osumilite

Reference List:
Miyashiro, A. (1953), Osumilite, a new mineral, and Cordierite in Volcanic rocks, Proceedings of the Japan Academy, Vol.29, 7, pp.321-323

Miyashiro, A. (1956): Osumilite, a new silicate mineral and its crystal structure, American Mineralogist, Vol. 41, pp. 104-116

Brown, G.E., Gibbs, G.V. (1969): Refinement of the crystal structure of Osumilite, American Mineralogist, Vol. 54, pp. 101-116

Olsen, E., Bunch, T.E. (1970): Compositions of natural Osumilites, American Mineralogist, Vol. 55, pp. 875-879

Chinner, G.A., Dixon, P.D. (1973): Irish Osumilite, Mineralogical Magazine, Vol. 3, pp. 189-192

Berg, J., Wheeler, E.P. (1976): Osumilite of deep-seated origin in the contact aureole of the anorthositic Nain complex, Labrador, American Mineralogist, Vol. 61, pp. 20-37

Goldman, D., Rossman, G. (1978): The site distribution of iron and anomalous biaxiality in Osumilite, American Mineralogist, Vol. 63, pp. 490-498

Schreyer, W., Hentschel, G., Abraham, K. (1983): Osumilith in der Eifel und die Verwendung dieses Minerals als petrogenetischer Indikator, Tschermaks mineralogische und petrographische Mitteilungen, Vol. 31, pp. 215-234

Armbruster, Th., Oberhänsli, R. (1988): Crystal chemistry of double-ring silicates: Structural, chemical, and optical variation in osumilites, American Mineralogist, 73, 585-594.

Parodi, G.C., Della Ventura, G., Lorand, J.P. (1989): Mineralogy and petrology of an unusual Osumilite + vanadium-rich pseudobrookite assemblage in an ejectum from the Vico Volcanic Complex (Latium, Italy), American Mineralogist, Vol. 74, pp. 1278-1284

Nowicki, T.E., Frimmel, H.E., and Waters, D.J. (1995): The occurrence of Osumilite in pelitic granulites of the Namaqualand metamorphic complex, South Africa. South Africa Journal of Geology: 98: 191-201

Sokol, E.V. (1997): The new genetic type of Osumilite occurrence, Zapiski RMO, Vol: 126(4), pp. 43-53

Ballasone, G. et al. (2008): Crystal chemical and structural characterisation of an Mg-rich Osumilite from Vesuvius volcano (Italy), European Journal of Mineralogy, Vol. 20, pp. 713-720

Nozomi SOGAWA, Keiji SHINODA, Norimasa SHIMOBAYASHI (2013): Water molecules in the channel-like cavities of osumilite. Journal of Mineralogical and Petrological Sciences 108, 101-104.


Internet Links for Osumilite

Localities for Osumilite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Antarctica
 
  • Eastern Antarctica
D. J. Ellis, J. W. Sheraton, R. N. England, W. B. Dallwitz (1980) Osumilite-sapphirine-quartz granulites from Enderby Land Antarctica — Mineral assemblages and reactions. Contributions to Mineralogy and Petrology 72:123-143
Austria
 
  • Burgenland
    • Oberpullendorf
      • Kobersdorf
        • Pauliberg
U. Kolitsch, W. Postl, H.-P. Bojar and W. Trattner (2009): Die Mineralvorkommen im Basalt des Pauliberges. In: Autorenkollektiv (Red. M. A. Götzinger und P. Huber) (2009): Die Mineralien des Burgenlandes - Geologie, Mineralogie und mineralische Rohstoffe. – Wissenschaftliche Arbeiten aus dem Burgenland, Band 126, Amt der Burgenländischen Landesregierung, Abteilung 7 - Landesmuseum, Eisenstadt, 83-99.
Germany
 
  • Bavaria
    • Franconia
      • Fichtelgebirge
        • Kemnath
Weiss: "Mineralfundstellen, Deutschland West", 1990
  • Rhineland-Palatinate
    • Eifel
      • Mayen
        • Ettringen
          • Bellerberg volcano
[Schreyer, W., Hentschel, G., Abraham, K., Osumilith in der Eifel und die Verwendung dieses Minerals als petrogenetischer Indikator , Tscherm. Mineral.- Petrogr. Mitt. 31, 215-234, 1983] [Lapis, 15 (5), 9-36]
Hungary
 
  • Szabolcs-Szatmár-Bereg Co.
    • Tarpa
Koch: Minerals of Hungary, 1985
Italy
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
        • Mt Vesuvius
Balassone, G., Franco, E., Mattia, C.A., Puliti, R. (2004): Indialite in xenolithic rocks from Somma-Vesuvius volcano (Southern Italy): crystal chemistry and petrogenetic features, American Mineralogist 89: 1-6
  • Sardinia
    • Oristano Province
      • Mt. Arci
        • Marrubiu
[Olsen, E., Bunch, T.E. (1970): Compositions of natural Osumilites, American Mineralogist, Vol. 55, pp. 875-879] [De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol]
Japan
 
  • Kyushu Region
    • Kagoshima Prefecture
      • Kagoshima City
        • Sakurajima
(mistaken locality attribution occasionally seen on labels because osumilite's type locality is nearby, but not on Sakurajima)
      • Kirishima City
        • Hayato
Kobayashi, T: (1978): Osumilites from Rishiri Islands, Hokkaido and Hoyato-cho, Kogashima Prefecture, Rept. Fac. Sci. Kogashima Univ., Vol. 8, pp. 61-69 (Japanese with English summary)
      • Osumi Peninsula
Proc.Japan Acad.(1953) 29, 321-323
New Zealand
 
  • North Island
    • Waikato
      • Taupo
        • Atiamuri
Personal collection of Rod Martin
Russia
 
  • Eastern-Siberian Region
    • Sakha Republic (Saha Republic; Yakutia)
[World of Stones 12:49]
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
Tajikistan
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
[Lapis 1991:12 p.42-48]
USA
 
  • Oregon
    • Lane Co.
      • McKenzie Pass
        • North Sister Mountain
Olsen E., Bunch T.E. (Am. Min. 55, 875-879, 1970)
Mineral and/or Locality  
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