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Osumilite-(Mg)

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Big Photo

Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
© C.H.M.-Schäfer

Show Osumilite-(Mg) Photos (14)



Formula:
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
System:HexagonalColour:Brown, blue
Hardness:5 - 6
Member of:Osumilite Group
Name:For relation to osumilite.


The Mg analogue of Osumilite.
Mg-dominant (at the octahedral site) analogues of osumilite have been described several times (Armbruster and Oberhänsli, 1988; Balassone et al., 2008; Seryotkin et al., 2008), but published without approval by the CNMNC.
Approved as a valid species by IMA in 2011, based upon a complete investigation of a type specimen from Bellerberg, Eifel, Rheinland-Pfalz, Germany.

NOTE: All localities listed here should be checked if they are to be assigned under osumilite-(Mg) or osumilite.

Classification of Osumilite-(Mg)

IMA status:Approved 2011
Strunz 8th edition ID:8/E.22-80
Nickel-Strunz 10th (pending) edition ID:9.CM.05

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

Type Locality:Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
Place of Conservation of Type Material:Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4174/1

Physical Properties of Osumilite-(Mg)

Lustre:Vitreous
Colour:Brown, blue
Hardness (Mohs):5 - 6

Crystallography of Osumilite-(Mg)

Crystal System:Hexagonal
Class (H-M):6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:P6/mcc {P6/m 2/c 2/c}
Cell Parameters:a = 10.0959(9) Å, c = 14.3282(2) Å
Ratio:a:c = 1 : 1.419
Unit Cell Volume:V 1,264.77 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
7.21(37)
5.538(36)
5.064(85)
4.137(45)
3.736(43)
3.234(100)
2.932(42)
2.767(51)

Optical Data of Osumilite-(Mg)

Type:Uniaxial (+)
RI values: nω = 1.541 nε = 1.543
Maximum Birefringence:δ = 0.002

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Osumilite-(Mg)

Formula:
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
Essential elements:Al, K, Mg, O, Si
All elements listed in formula:Al, K, Mg, O, Si

Relationship of Osumilite-(Mg) 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
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
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
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
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
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30

Other Names for Osumilite-(Mg)

Synonyms:
IMA2011-083
Other Languages:
German:Osumilith-(Mg)
Japanese:苦土大隅石
Russian:Осумилит-(Mg)

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-(Mg)

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

- 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

- Chukanov, N.V., Pekov, I.V., Rastsvetaeva, R.K., Aksenov, S.M.,Belakovskiy, D.I., Schüller, W. and Ternes, B.(2012): Osumilite-(Mg), IMA 2011-083. CNMNC Newsletter No. 12, February 2012, page 153; Mineralogical Magazine, 76, 151-155.

Internet Links for Osumilite-(Mg)

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    • Localities for Osumilite-(Mg)

    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.
    Hide Locality List
    (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
          • Tula Mts
    		Grew, E. (1982): Osumilite in the Sapphirine-Quartz terrane of Enderby Land, Antarctica:…., American Mineralogist, Vol. 67, pp. 762-787
    Grew, E. (1982): Osumilite in the Sapphirine-Quartz terrane of Enderby Land, Antarctica:…., American Mineralogist, Vol. 67, pp. 762-787
    Grew, E. (1982): Osumilite in the Sapphirine-Quartz terrane of Enderby Land, Antarctica:…., American Mineralogist, Vol. 67, pp. 762-787
    Grew, E. (1982): Osumilite in the Sapphirine-Quartz terrane of Enderby Land, Antarctica:…., American Mineralogist, Vol. 67, pp. 762-787
            • Mt. Riiser-Larsen
    		Grew, E. (1982): Osumilite in the Sapphirine-Quartz terrane of Enderby Land, Antarctica:…., American Mineralogist, Vol. 67, pp. 762-787
    Grew, E. (1982): Osumilite in the Sapphirine-Quartz terrane of Enderby Land, Antarctica:…., American Mineralogist, Vol. 67, pp. 762-787
    Canada
     
    • Newfoundland and Labrador
      • Labrador
        • Grenville
    		Arima, M., Gower, C. (1991): Osumilite-bearing Granulites in the Eastern Grenville Province, Eastern Labrador, Canada: Mineral Parageneses and Metamorphic Conditions, Journal of Petrolog, Vol. 32 (1), pp. 29-61
        • Nain Complex
    		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
    France
     
    • Auvergne
      • Haute-Loire
        • Le Puy-en-Velay
          • Espaly-Saint-Marcel
    		[Barrier D, Pourtier G, Médard P (2004) Minéralogie du mont Denise (Haute-Loire). Le Cahier des Micromonteurs 83: 3-11] [Médard E, Médard P, Pourtier G (2012) La chayesite, un autre minéral du groupe de l'osumilite à la Denise. Le Cahier des Micromonteurs 115: 22-23]
    Germany
     
    • Hesse
      • Eschwege
    		 Schreyer, W., Blümel, P. & Maresch, W. (1986): Cordierit und Osumilith aus den Buchiten der Blauen Kuppe bei Eschwege. Aufschluss, Jg.37, Nr.11, S.353-67
    • Rhineland-Palatinate
      • Eifel
        • Andernach
          • Eich
    		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
          • Nickenich
    		Hentschel, G., Osumilith in der Eifel und die Verwendung dieses Minerals als petrogenetischer Indikator, Tschermaks Min. Petr. Mitt, 31, 215-234, 1983
        • Daun
          • Strohn
    		Blass, G., Emmerich, F., Graf, HW., Schäfer, Ch., Tschörtner, J., (2006): Minerale der Eifelvulkane, Version 1.0, CD, published by authors
          • Üdersdorf
    		Schäfer, H., Die Mineralien der Einschlüsse und Auswürflinge in den Schlacken des Emmelberges bei Üdersdorf / Eifel, Der Aufschluss 30, 273-282, 1979
        • Kelberg
          • Drees
    		Schüller, W., Die Mineralien des Niveligsberges bei Drees in der Eifel, Der Aufschluß SB 33, 1990
        • Mayen
          • Ettringen
            • Bellerberg volcano
    		Hentschel, G., Abraham, K., Schreyer, W., Roedderit und Osumilith aus dem Laacher Vulkangebiet , Fortschr. Mineral. 55, Beih. 1, 43-44, 1977; Chukanov, N.V., Pekov, I.V., Rastsvetaeva, R.K., Aksenov, S.M.,Belakovskiy, D.I., Schüller, W. and Ternes, B.(2012): Osumilite-(Mg), IMA 2011-083. CNMNC Newsletter No. 12, February 2012, page 153; Mineralogical Magazine, 76, 151-155.
        • Mendig
          • Bell
    		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
        • Niederzissen
          • Burgbrohl
    		Hentschel, G., Osumilith in der Eifel und die Verwendung dieses Minerals als petrogenetischer Indikator, Tschermaks Min. Petr. Mitt, 31, 215-234, 1983
        • Polch
          • Ochtendung
    		Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
    • Thuringia
      • Gera
        • Ronneburg U deposit
    		T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
    Hungary
     
    • Veszprém Co.
      • Balaton Uplands
        • Tapolcai Basin
          • Badacsonytomaj
    		GEODA 2007/1
    India
     
    • Andhra Pradesh
      • Visakhapatnam District
    		 Eur. J. Mineral. , 1991, 3, pp. 367-386.
    Italy
     
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
          • Mt Vesuvius
    		Balassone G, Mormone A, Rossi M, Bernardi A, Fisch M, Armbruster T, Malsy AK, Berger A (2008) Crystal chemical and structural characterization of an Mg-rich osumilite from Vesuvius volcano (Italy). European Journal of Mineralogy 20: 713-720
    • Latium
      • Viterbo Province
        • Vico Lake
    		Parodi GC, Dela Ventura G, Lorand JP (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
    Japan
     
    • Hokkaido
      • Kitami
    		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)
    • Honshu Island
      • Chubu Region
        • Gifu Prefecture
          • Hida City
    		Labels of several dealers at Tokyo show, December 2005.
              • Tsukigase
    		Alfredo Petrov collection
    • Kyushu Region
      • Kagoshima Prefecture
        • Satsumasendai City
          • Iriki
    		Alfredo Petrov - unpublished documents
      • Oita prefecture
        • Beppu
    		Yokomizo & Miyachi (1978) Ganseki-Koubutsu-Koshogaku Zasshi, 73, 180-182.
        • Hayami-gun
    		Alfredo Petrov collection
    New Zealand
     
    • North Island
      • Bay of Plenty
        • Rotorua
          • Mt Ngongotaha
    		Grapes, R., Thornton, J., and Howard, D. (1993. Vug minerals in rhyolite, Hendersons Quarry, Mount Ngongotaha, Geological Society of New Zealand, Miscellaneous Publication 79A: 76.
    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
    		Waters, D. J. (1991): Hercynite-quartz granulites; phase relations, and implications for crustal processes. European Journal of Mineralogy 3: 367-386
    Peru
     
    • Puno Department
    		Eur. J. Mineral. , 1994, 6, pp. 145-150.
    Russia
     
    • Far-Eastern Region
      • Khabarovskiy Kray
        • Stanovoi Range
    		Bogdanova N.G., Troneva N.V., Sukhanov M.K., Berkhin S.I. (1980) On the first occurrence of metamorphical osumilite in USSR, - DAN SSSR, v.250, N.3, pp. 690-693 (in Rus.)
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
    		Seryotkin, Y. et al. (2008): Pyrometamorphic osumilite: occurence, paragenesis, and crystal structure as compared to cordierite, European Journal of Mineralogy, Vol. 20, pp. 191-198
    South Africa
     
    • Northern Cape Province
      • Namaqualand
        • Okiep Copper District
    		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 African. Journal of Geology, Vol. 98, pp. 191-201.
    Uganda
     
    • Kotido District (Karamoja District)
    		Eur. J. Mineral. , 1991, 3, pp. 367-386.
    UK
     
    • Northern Ireland
      • Co. Antrim
    		Chinner, G. A. and Dixon, P.D. (1973): Irish osumilite. Mineralogical Magazine, 39, 189-192.
    USA
     
    • Oregon
      • Lane Co.
        • McKenzie Pass
          • North Sister Mountain
    		D.E. Russell Collection
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