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Osumilite

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Wannenköpfe, Ochtendung, Polch, Eifel Mts, Rhineland-Palatinate, Germany
© Fred Kruijen

Show Osumilite Photos (73)
Formula:
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
System:HexagonalColour:Blue
Hardness:5 - 6


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 Island, 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
Essential elements:Al, Fe, H, 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 Group:
Osumilite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.CM.05Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
9.CM.05Brannockite
(K,Na)Li
 
3
Sn
 
2
Si
 
12
O
 
30
9.CM.05Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
9.CM.05Darapiosite
KNa
 
2
Li(Mn,Zn)
 
2
ZrSi
 
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)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
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,Fe)
 
3
(Zr,Ti,Fe)Si
 
12
O
 
30
9.CM.05Sugilite
KNa
 
2
(Fe,Mn,Al)
 
2
Li
 
3
Si
 
12
O
 
30
9.CM.05Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
9.CM.05Berezanskite
KLi
 
3
Ti
 
2
Si
 
12
O
 
30
9.CM.05Dusmatovite
K(K,Na,[ ])(Mn
2+
 
,Y,Zr)
 
2
(Zn,Li)
 
3
Si
 
12
O
 
30
9.CM.05Shibkovite
K(Ca,Mn,Na)
 
2
(K
 
2-x
,□
 
x
)
 
2
Zn
 
3
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
([],K)(Mg, Fe
2+
 
)
 
3
Fe
3+
2
[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
]
16.24.4Magnesioferrikatophorite
[Na][CaNa][Mg
 
4
(Fe
3+
 
,Al)][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.24.5Ferrikatophorite
Na[CaNa][Fe
2+
4
(Fe
3+
 
,Al)][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.24.6Barroisite
☐[CaNa][Mg
 
3
AlFe
3+
 
][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.24.7Ferribarroisite
☐[CaNa][Mg
 
3
Fe
3+
2
][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.24.8Alumino-ferrobarroisite
☐[CaNa][Fe
2+
3
Al
 
2
][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.24.9Ferrobarroisite
☐[CaNa][Fe
2+
3
AlFe
3+
 
][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.24.10Ferri-ferrobarroisite
☐[CaNa][Fe
2+
3
Fe
3+
2
][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.24.11Hastingsite
[Na][Ca
 
2
][Fe
2+
4
Fe
3+
 
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.24.12Magnesiohastingsite
Na[Ca
 
2
][Mg
 
4
Fe
3+
 
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.24.13Taramite
Na[CaNa][Fe
2+
3
AlFe
3+
 
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.24.14Ferri-magnesiotaramite
Na[CaNa][Mg
 
3
Fe
3+
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.24.15Magnesiotaramite
Na[CaNa][Mg
 
3
AlFe
3+
 
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.24.16Osumilite-(Mg)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O

Other Names for Osumilite

Synonyms:
Osumilite-(Fe)
Other Languages:
German:Osumilit
Osumilith
Japanese:大隅石
Russian:Осумилит
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:American Mineralogist (1956): 41: 104-116.

Canadian Mineralogist (1988): 73: 585-594.

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.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1997): 126(4): 43-53.

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

Internet Links for Osumilite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Osumilite in the Natural History Museum (London) online catalogue
  • Osumilite details from Handbook of Mineralogy (PDF)
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    Localities for Osumilite

    Hide Locality List
    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
      • Enderby Land
        • Napier Complex
          • Amundsen Bay
    		Polar Geoscience 14:1-24
        • Tula Mts
          • Mt. Riiser-Larsen
    		Y. Motoyoshi and B.J. Hensen, Eur. J. Mineral., 1989, 1, pp. 467-471.
    Austria
     
    • Burgenland
      • Oberpullendorf
        • Kobersdorf
          • Pauliberg Mt.
    		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.
    Canada
     
    • Newfoundland and Labrador
    		Journal of Petrology 32:29-61 (1991)
        • Nain Complex
    		AmMin. 61:29-37
    France
     
    • Auvergne
      • Haute-Loire
        • Le Puy-en-Velay
          • Espaly-Saint-Marcel
    		D. BARRIER, G. POURTIER & P. MEDARD, 2004, Minéralogie du Mont Denise (Haute-Loire), Le Cahier des Micromonteurs, 83, pp 3-8
    Germany
     
    • Bavaria
      • Franconia
        • Fichtelgebirge
          • Kemnath
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Hesse
      • North Hesse
        • Eschwege
    		S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Rhineland-Palatinate
      • Eifel Mts
        • Mayen
          • Ettringen
            • Bellerberg volcano
              • Ettringer Bellerberg Mt. (Bellberg Mt.; Bellenberg Mt.; Billenberg Mt.; Boilenberg Mt.)
    		[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
    India
     
    • Andhra Pradesh
      • Visakhapatnam District
    		Eur. J. Mineral. , 1991, 3, pp. 367-386.
    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
    		De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol
    Japan
     
    • Kyushu Island
      • Kagoshima Prefecture
        • Aira
        • Kagoshima City
    		(mistaken locality attribution occasionally seen on labels because osumilite's type locality is nearby, but not on Sakurajima)
        • Osumi Peninsula
    		Proc.Japan Acad.(1953) 29, 321-323
    New Zealand
     
    • North Island
      • Bay of Plenty
        • Rotorua
          • Mt. Ngongotaha
    		Martin Stolworthy Collection
      • Taupo
        • Atiamuri
    		Personal collection of Rod Martin
    Norway
     
    • Rogaland
      • Bjerkreim
        • Vikeså
    		Maijer, C.; Jansen, J.B.H.; Wevers, J. & Poorter, R. P. E. (1977): Contribution to the mineralogy of Norway, no 63. Osumilite, a new mineral to Norway. Norsk Geologisk Tidsskrift 57 (2), 187-188
      • Lund
        • Flatestøl
    		Eur. J. Mineral. , 1991, 3, pp. 367-386.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
    		[World of Stones 12:49]
    South Africa
     
    • Northern Cape Province
    Tajikistan
     
    • Region of Republican Subordination
      • Tien Shan Mts
        • Alai (Alayskiy) Range
    		[Lapis 1991:12 p.42-48]
    Uganda
     
    • Kotido District (Karamoja District)
    		Eur. J. Mineral. , 1991, 3, pp. 367-386.
    USA
     
    • Oregon
      • Lane Co.
          • North Sister Mountain
    		Olsen E., Bunch T.E. (Am. Min. 55, 875-879, 1970)
    Mineral and/or Locality
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