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Osumilite-(Mg)

Big Photo

Caspar quarry, Ettringer Bellerberg Mt. (Bellberg Mt.; Bellenberg Mt.; Billenberg Mt.; Boilenberg Mt.), Bellerberg volcano, Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
© C.H.M.-Schäfer

Show Osumilite-(Mg) Photos (4)
Formula:
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
System:HexagonalColour:Brown
Hardness:5 - 6
Name:For relation to osumilite.


Osumilite Group.

The Mg analogue of Osumilite.

Published without IMA approval, with first recorded locality being Tieveragh, Co. Antrim, Northern Ireland, UK.

Classification of Osumilite-(Mg)

IMA status:Published without Approval
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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Physical Properties of Osumilite-(Mg)

Lustre:Vitreous
Colour:Brown
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 = 10.0946(9) Å, c = 14.3311(9) Å
Ratio:a:c = 1 : 1.42
Unit Cell Volume:V 1,264.70 ų (Calculated from Unit Cell)
Z:2
Comment:Composition close to end member (Balassone et al., 2008)

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:
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
Essential elements:Al, H, K, Mg, O, Si
All elements listed in formula:Al, Fe, H, K, Mg, Na, O, Si

Relationship of Osumilite-(Mg) to other Species

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
(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,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
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30

Other Names for Osumilite-(Mg)

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:American Mineralogist (1974): 59: 383.

American Mineralogist (1982): 67: 762-787.

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

Giuseppina Balassone, Angela Mormone, Manuela Rossi, Alessandro Bernardi, Martin Fisch, Thomas Armbruster, Anna Kathrin Malsy & Alfons Berger (2008): Crystal chemical and structural characterization of an Mg-rich osumilite from Vesuvius volcano (Italy). Eur. J. Mineral. 20, 713-720.

Internet Links for Osumilite-(Mg)

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    Localities for Osumilite-(Mg)

    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.
    Germany
     
    • Rhineland-Palatinate
      • Eifel Mts
        • 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
              • Ettringer Bellerberg Mt. (Bellberg Mt.; Bellenberg Mt.; Billenberg Mt.; Boilenberg Mt.)
    		Hentschel, G., Abraham, K., Schreyer, W., Roedderit und Osumilith aus dem Laacher Vulkangebiet , Fortschr. Mineral. 55, Beih. 1, 43-44, 1977
        • 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.
      • Tapolcai Basin
        • Badacsonytomaj
    		GEODA 2007/1
    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
     
    • Honshu Island
      • Chubu Region
        • Gifu Prefecture
          • Hida
    		Labels of several dealers at Tokyo show, December 2005.
    • Kyushu Island
      • Kagoshima Prefecture
        • Satsuma-gun
          • Iriki
    		Alfredo Petrov - unpublished documents
      • Oita prefecture
        • Beppu
    		Yokomizo & Miyachi (1978) Ganseki-Koubutsu-Koshogaku Zasshi, 73, 180-182.
    Peru
     
    • Puno Department
    		Eur. J. Mineral. , 1994, 6, pp. 145-150.
    UK
     
    • Northern Ireland
      • Co. Antrim
    USA
     
    • Oregon
      • Lane Co.
          • North Sister Mountain
    		D.E. Russell Collection
    Mineral and/or Locality
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