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5 - 6
Crystal System:
Member of:
Named in 1953 by Akiho Miyashiro for the Osumi Peninsula, Japan, on which the type locality is found.
Osumilite Group.

Difficult to distinguish from Osumilite-(Mg).

Compare 'UM1984-35-SiO:AlCaFeKMg'.

Hide all sections | Show all sections

Classification of OsumiliteHide

Approved, 'Grandfathered' (first described prior to 1959)

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

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

16 : Silicates Containing Aluminum and other Metals
24 : Aluminosilicates of Fe, Mg, Ca and alkalis

Physical Properties of OsumiliteHide

Transparent, Translucent
Strongly pleochroic
5 - 6 on Mohs scale

Chemical Properties of OsumiliteHide

IMA Formula:
Common Impurities:

Crystallography of OsumiliteHide

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

Type Occurrence of OsumiliteHide

Synonyms of OsumiliteHide

Other Language Names for OsumiliteHide

Simplified Chinese:大隅石

Relationship of Osumilite to other SpeciesHide

Member of:
Other Members of this group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Klöchite(□Na)KFe2+2Zn3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tridymite19 photos of Osumilite associated with Tridymite on
Quartz5 photos of Osumilite associated with Quartz on
Pseudobrookite5 photos of Osumilite associated with Pseudobrookite on
Hematite4 photos of Osumilite associated with Hematite on
Cordierite3 photos of Osumilite associated with Cordierite on
Mullite3 photos of Osumilite associated with Mullite on
Albite-Anorthite Series2 photos of Osumilite associated with Albite-Anorthite Series on
Magnetite1 photo of Osumilite associated with Magnetite on
Osumilite Group1 photo of Osumilite associated with Osumilite Group on
Phlogopite1 photo of Osumilite associated with Phlogopite on

Related Minerals - Nickel-Strunz GroupingHide

9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

63.2.1a.1Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.2ChayesiteK(Mg,Fe)4FeSi12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.3DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.10Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)
63.2.1a.11DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.12MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.13SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.14Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.24.1Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
16.24.2Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
16.24.5Ferro-ferri-katophoriteNa(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2Mon. 2/m : B2/m
16.24.9Ferro-barroisite☐{CaNa}{Fe2+3Al2}(AlSi7O22)(OH)2Mon. 2/m : B2/m
16.24.13Taramite Root NameA(CaNa)(Z2+3Z3+2)(Al2Si6O22)(OH,F,Cl)2
16.24.16Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc

Other InformationHide

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 OsumiliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Miyashiro, A. (1953) Osumilite, a new mineral, and cordierite in volcanic rocks. Proceedings of the Japan Academy: 29(7): 321-323.
Miyashiro, A. (1956) Osumilite, a new silicate mineral and its crystal structure. American Mineralogist: 41: 104-116.
Brown, G.E., Gibbs, G.V. (1969) Refinement of the crystal structure of Osumilite. American Mineralogist: 54: 101-116.
Olsen, E., Bunch, T.E. (1970) Compositions of natural Osumilites. American Mineralogist: 55: 875-879.
Chinner, G.A., Dixon, P.D. (1973) Irish Osumilite. Mineralogical Magazine: 3: 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: 61: 20-37.
Goldman, D., Rossman, G. (1978) The site distribution of iron and anomalous biaxiality in Osumilite. American Mineralogist: 63: 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: 31: 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: 74: 1278-1284.
Nowicki, T.E., Frimmel, H.E., 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): 43-53.
Balassone, G., Mormone, A., Rossi, M., Bernardi, A., Fisch, M., Armbruster, T., Malsy, K., Berger, A. (2008) Crystal chemical and structural characterisation of an Mg-rich Osumilite from Vesuvius volcano (Italy). European Journal of Mineralogy: 20: 713-720.
Sogawa, N., Shinoda, K., Shimobayashi, N. (2013) Water molecules in the channel-like cavities of osumilite. Journal of Mineralogical and Petrological Sciences: 108: 101-104.

Internet Links for OsumiliteHide

Localities for OsumiliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • 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
  • 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.
  • 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
  • Szabolcs-Szatmár-Bereg Co.
    • Tarpa
Koch: Minerals of Hungary, 1985
  • 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]
  • Honshu Island
    • Chugoku Region
      • Yamaguchi Prefecture
        • Yamaguchi City
          • Yoshiki
Miura, Y. (2011) Osumilite-Like Phases in Chondrules of the Nio Chondrite, Yamaguchi, Japan. Formation of the First Solids in the Solar System. pdf#9013.
  • 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
  • Tokyo Metropolis
    • Izu Archipelago
photo in: Koubutsu Doshikai (2017) Kanto-to Shuhen-no Koubutsu (279pp).
New Zealand
  • North Island
    • Waikato
      • Taupo
        • Atiamuri
Personal collection of Rod Martin
  • 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).
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
[Lapis 1991:12 p.42-48]
  • Oregon
    • Lane Co.
      • McKenzie Pass
        • North Sister Mountain
Olsen E., Bunch T.E. (Am. Min. 55, 875-879, 1970); Martin, A.M.,Médard, M.,Devouard, B., Keller, L. P., Righter, K., Devidal, J-L., and Rahman, Z. (2015): Fayalite oxidation processes in Obsidian Cliffs rhyolite flow, Oregon. American Mineralogist: 100: 1153–1164.
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