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Brannockite

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Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
© JBS 2006

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Formula:
(K,Na)□
 
2
Li
 
3
(Sn,Zr,Ti)
 
2
[Si
 
12
O
 
30
]
System:HexagonalHardness:5 - 6
Member of:Osumilite Group
Name:Named in honor of Dr. Kent Combs Brannock (1923-1973), Kingsport, Tennessee, USA, chemist and mineral collector.
This page provides mineralogical data about Brannockite.

Classification of Brannockite

IMA status:Approved
Strunz 8th edition ID:8/E.22-140
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.1

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:14.12.1

14 : Silicates not Containing Aluminum
12 : Silicates of Sn
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Type Occurrence of Brannockite

Type Locality:Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
Year of Discovery:1973

Physical Properties of Brannockite

Hardness (Mohs):5 - 6

Crystallography of Brannockite

Crystal System:Hexagonal
Cell Parameters:a = 10.01Å, c = 14.24Å
Ratio:a:c = 1 : 1.423
Unit Cell Volume:V 1,235.69 ų (Calculated from Unit Cell)

Optical Data of Brannockite

Type:Uniaxial (-)
RI values: nω = 1.567 nε = 1.566
Maximum Birefringence:δ = 0.001

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

Chemical Properties of Brannockite

Formula:
(K,Na)□
 
2
Li
 
3
(Sn,Zr,Ti)
 
2
[Si
 
12
O
 
30
]
Idealised Formula:
K□
 
2
Li
 
3
Sn
 
2
[Si
 
12
O
 
30
]
Essential elements:K, Li, O, Si, Sn
All elements listed in formula:K, Li, Na, O, Si, Sn, Ti, Zr
Common Impurities:Na

Relationship of Brannockite 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
]
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
 
3
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
Osumilite-(Mg)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
 · H
 
2
O
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
(□,K)(Mg, Fe
2+
 
)
 
3
Fe
3+
2
[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.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)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
 · 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
(□,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:

- +
14.12.2Malayaite
CaSn(SiO
 
4
)O
14.12.3Stokesite
CaSn[Si
 
3
O
 
9
] · 2H
 
2
O
14.12.4Pabstite
Ba(Sn,Ti)(Si
 
3
O
 
9
)

Other Names for Brannockite

Synonyms:
IMA1972-029
Other Languages:
German:Brannockit
Russian:Бреннокит
Spanish:Brannockita

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 Brannockite

Reference List:

- +
Mineralogical Record: 4: 73-76.

American Mineralogist: 58: 1111.

American Mineralogist: 73: 595-600.

Internet Links for Brannockite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Brannockite details from Handbook of Mineralogy (PDF)
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    • Localities for Brannockite

    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.
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    (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.
    USA
     
    • North Carolina
      • Cleveland Co.
        • Kings Mountain District
    		Rocks & Minerals: 60: 65, 76-83.; Rocks and Minerals, (1985) 60:76-82; Carolina Geological Society Field Trip Guidebook 1981, 39-48
      • Gaston Co.
        • Bessemer City
    		No reference listed
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 25th Jun 2011 21:23:07
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