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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)Li
 
3
Sn
 
2
Si
 
12
O
 
30
System:HexagonalHardness:5 - 6
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)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
Common Impurities:Na

Relationship of Brannockite to other Species

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
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.05Osumilite
(K,Na)(Fe,Mg)
 
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
ZnSi
 
12
O
 
30
9.CM.05Almarudite
(K,Na)(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[O|SiO
 
4
]
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
German names:
Brannockit
Russian names:
Бреннокит
Spanish names:
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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    Localities for Brannockite

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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.
      • Gaston Co.
        • Bessemer City
    		No reference listed
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