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Osumilite

Big Photo

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

Show Osumilite Photos (84)
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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    Localities for Osumilite

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