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Osumilite

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Formula:
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
System:HexagonalColour:Blue
Hardness:5 - 6
Member of:Osumilite Group


Osumilite Group.

Difficult to distinguish from Osumilite-(Mg).

Classification of Osumilite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/E.22-90
Nickel-Strunz 10th (pending) edition ID:9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th edition ID:63.2.1a.6

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:16.24.16

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

Type Locality:Sakkabira, Osumi Peninsula, Kagoshima Prefecture, Kyushu Region, Japan
Year of Discovery:1953

Physical Properties of Osumilite

Lustre: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)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
Simplified for copy/paste:(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Essential elements:Al, Fe, K, O, Si
All elements listed in formula:Al, Fe, K, Mg, Na, O, Si
Common Impurities:Ti,Mn,Ba,K

Relationship of Osumilite to other Species

Member of:Osumilite Group
Other Members of Group:

- +
Almarudite
K(□,Na)
 
2
(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
· 2H
 
2
O
Berezanskite
K□
 
2
Li
 
3
(Ti,Zr,Sn)
 
2
[Si
 
12
O
 
30
]
Brannockite
(K,Na)□
 
2
Li
 
3
(Sn,Zr,Ti)
 
2
[Si
 
12
O
 
30
]
Darapiosite
KNa
 
2
(Zn,Li)
 
3
(Mn,Zr)
 
2
[Si
 
12
O
 
30
]
Dusmatovite
K(Na,□)
 
2
(Zn,Li)
 
3
(Mn
2+
 
,Y,Zr)
 
2
[Si
 
12
O
 
30
]
Friedrichbeckeite
K(□
 
0.5
Na
 
0.5
)
 
2
Mg
 
2
Be
 
3
Si
 
12
O
 
30
Klöchite
(□Na)KFe
2+
2
Zn
 
3
(Si
 
12
O
 
30
)
Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
· H
 
2
O
Osumilite-(Mg)
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
Shibkovite
K(□,K,Na)
 
2
Zn
 
3
Ca
 
2
[Si
 
12
O
 
30
]
Sogdianite
K(□,Na)
 
2
Li
 
3
(Zr,Fe,Ti)
 
2
[Si
 
12
O
 
30
]
Sugilite
K(Na,□)
 
2
Li
 
3
(Fe,Mn,Al,Zr)
 
2
[Si
 
12
O
 
30
]
Trattnerite
□(Fe
3+
 
,Mg,Fe
2+
 
)
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
3
(Si
 
12
O
 
30
)
Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
Related Minerals - Nickel-Strunz Grouping):

- +
9.CM.05Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
· 2H
 
2
O
9.CM.05Brannockite
(K,Na)□
 
2
Li
 
3
(Sn,Zr,Ti)
 
2
[Si
 
12
O
 
30
]
9.CM.05Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
9.CM.05Darapiosite
KNa
 
2
(Zn,Li)
 
3
(Mn,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Eifelite
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
9.CM.05Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
9.CM.05Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
· H
 
2
O
9.CM.05Osumilite-(Mg)
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
9.CM.05Poudretteite
KNa
 
2
B
 
3
Si
 
12
O
 
30
9.CM.05Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
9.CM.05Sogdianite
K(□,Na)
 
2
Li
 
3
(Zr,Fe,Ti)
 
2
[Si
 
12
O
 
30
]
9.CM.05Sugilite
K(Na,□)
 
2
Li
 
3
(Fe,Mn,Al,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
9.CM.05Berezanskite
K□
 
2
Li
 
3
(Ti,Zr,Sn)
 
2
[Si
 
12
O
 
30
]
9.CM.05Dusmatovite
K(Na,□)
 
2
(Zn,Li)
 
3
(Mn
2+
 
,Y,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Shibkovite
K(□,K,Na)
 
2
Zn
 
3
Ca
 
2
[Si
 
12
O
 
30
]
9.CM.05Almarudite
K(□,Na)
 
2
(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
9.CM.05Trattnerite
□(Fe
3+
 
,Mg,Fe
2+
 
)
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
3
(Si
 
12
O
 
30
)
9.CM.05Oftedalite
(Sc,Ca,Mn
2+
 
)
 
2
K[(Be,Al)
 
3
Si
 
12
O
 
30
]
9.CM.10Faizievite
K
 
2
Na(Ca
 
6
Na)Ti
 
4
Li
 
6
[F
 
2
|Si
 
24
O
 
66
]
Related Minerals - Hey's Index Grouping:

- +
16.24.1Aegirine-augite
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,Mg,Al)Si
 
2
O
 
6
16.24.2Omphacite
(Ca,Na)(Mg,Al)Si
 
2
O
 
6
16.24.4Ferri-katophorite
Na(CaNa)(Mg
 
4
Fe
3+
 
)(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.5Ferro-ferri-katophorite
NaCaNaFe
2+
4
(Fe
3+
 
)[(AlSi
 
7
)O
 
22
](OH)
 
2
16.24.6Barroisite
☐{CaNa}{Mg
 
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.7Ferri-barroisite
☐(CaNa)(Mg
 
3
Fe
3+
2
)(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.8Alumino-ferrobarroisite
☐{CaNa}{Fe
2+
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.9Ferro-barroisite
☐{CaNa}{Fe
2+
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.10Ferro-ferri-barroisite
☐(CaNa)(Fe
2+
3
Fe
3+
2
)(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.11Hastingsite
{Na}{Ca
 
2
}{Fe
2+
4
Fe
3+
 
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.12Magnesio-hastingsite
{Na}{Ca
 
2
}{Mg
 
4
Fe
3+
 
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.13Taramite Group
A(CaNa)(Z
2+
3
Z
3+
2
)(Al
 
2
Si
 
6
O
 
22
)(OH,F,Cl)
 
2
16.24.14Ferri-taramite
Na(CaNa)(Mg
 
3
Fe
3+
2
)(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.15Magnesiotaramite
{Na}{CaNa}{Mg
 
3
AlFe
3+
 
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.16Osumilite-(Mg)
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30

Other Names for Osumilite

Synonyms:
Osumilite-(Fe)
Other Languages:
German:Osumilit
Osumilith
Japanese:大隅石
Russian:Осумилит
Simplified Chinese:大隅石
Spanish:Osumilita

Other Information

Health Warning: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

Search Engines:
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  • External Links:
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  • Look for Osumilite on Wikipedia
  • Look for Osumilite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Osumilite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Specimens:The following Osumilite specimens are currently listed for sale on minfind.com.

    Localities for Osumilite

    The 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. ? 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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