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Brannockite

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About BrannockiteHide

Kent C. Brannock
Formula:
(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
Colour:
Colorless
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
2.98
Crystal System:
Hexagonal
Member of:
Name:
Named by John S. White Jr., J.E. Arem, J.A. Nelen, P.B. Leavens, and R.W. Thomssen in 1973 in honor of Dr. Kent Combs Brannock (20 July 1923, Independence, Virginia, USA - 21 February 1973, Kingsport, Tennesse, USA), chemist and mineral collector. He did a lot of early collecting at the type locality (Foote Mine).
One of two K-Li-Sn minerals by alexandrovite.


Classification of BrannockiteHide

Approved
First Published:
1973
8/E.22-140
9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
63.2.1a.1

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
14.12.1

14 : Silicates not Containing Aluminum
12 : Silicates of Sn

Physical Properties of BrannockiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Comment:
semitransparent
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
2.98 g/cm3 (Measured)    3.08 g/cm3 (Calculated)

Optical Data of BrannockiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.567 nε = 1.566
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of BrannockiteHide

Formula:
(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
IMA Formula:
KSn2(Li3Si12)O30
Idealised Formula:
K□2Li3Sn2[Si12O30]
Common Impurities:
Na

Crystallography of BrannockiteHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mcc
Cell Parameters:
a = 10.01 Å, c = 14.24 Å
Ratio:
a:c = 1 : 1.423
Unit Cell V:
1,235.69 ų (Calculated from Unit Cell)
Morphology:
platy
Twinning:
common, perpendicular to [0001] (observable by X-Ray analysis only)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.109 (100)
2.905 (90)
7.141 (80)
4.343 (80)
5.714 (70)
8.693 (60)
2.681 (60)
(

Type Occurrence of BrannockiteHide

General Appearance of Type Material:
very thin hexagonal plates, to 1 mm; {0001} form dominates
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 125045.
Geological Setting of Type Material:
vugs and fractures of late-hydrothermal parts of a Li-Sn pegmatite
Associated Minerals at Type Locality:

Synonyms of BrannockiteHide

Other Language Names for BrannockiteHide

Relationship of Brannockite to other SpeciesHide

Member of:
Other Members of this group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
EifeliteKNa3Mg4Si12O30Hex.
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Klöchite(□Na)KFe2+2Zn3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
Merrihueite(K,Na)2(Fe,Mg)5Si12O30Hex.
MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30Hex.
Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]Hex.
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
UM1990-73-SiO:KMnNaZn(K,Na)2Zn3Mn1.5Si12O30Hex.
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)

Related Minerals - Nickel-Strunz GroupingHide

9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05EifeliteKNa3Mg4Si12O30Hex.
9.CM.05Merrihueite(K,Na)2(Fe,Mg)5Si12O30Hex.
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30Hex.
9.CM.05PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]Hex.
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

63.2.1a.2ChayesiteK(Mg,Fe)4FeSi12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.3DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.4EifeliteKNa3Mg4Si12O30Hex.
63.2.1a.5Merrihueite(K,Na)2(Fe,Mg)5Si12O30Hex.
63.2.1a.6Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30Hex.
63.2.1a.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.9SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]Hex.
63.2.1a.10Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)
63.2.1a.11DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.12MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.13SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.14Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.12.2MalayaiteCaSn(SiO4)OMon.
14.12.3StokesiteCaSn[Si3O9] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
14.12.4PabstiteBa(Sn,Ti)(Si3O9)Hex.

Fluorescence of BrannockiteHide

bright bluish white (SW)

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BrannockiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
White Jr., J.S., Arem, J.E., Nelen, J.A., Leavens, P.B., Thomssen, R.W. (1973) Brannockite, a new tin mineral. Mineralogical Record: 4: 73-76.
Fleischer, M. (1973) New mineral names. American Mineralogist: 58: 1111-1115.
Armbruster, T., Oberänsli, R. (1988) Crystal chemistry of double-ring silicates: Structures of sugilite and brannockite. American Mineralogist: 73: 595-600.
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)
Raschke, M.B., Anderson, E.J.D., Allaz, J., Friis, H., Smyth, J.R., Tschernich, R., Becker, R. (2016) Crystal chemistry of brannockite, KLi3Sn2Si12O30, from a new occurrence in the Golden Horn Batholith, Washington State, USA. European Journal of Mineralogy: 28: 153-161.

Internet Links for BrannockiteHide

Localities for BrannockiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tajikistan
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
Agakhanov, Atali A., Leonid A. Pautov, Elena Sokolova, Yassir A. Abdu, and Vladimir Y. Karpenko. "Two Astrophyllite-Supergroup Minerals: Bulgakite, A New Mineral From the Darai-Pioz Alkaline Massif, Tajikistan and Revision of the Crystal Structure and Chemical Formula of Nalivkinite." The Canadian Mineralogist 54, no. 1 (2016): 33-48.
USA (TL)
 
  • 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
  • Washington
    • Okanogan Co.
      • Golden Horn Batholith
Raschke, M.B et al (2015) Crystal chemistry of brannockite, from a new occurrence in the Golden Horn Batholith, Washington State, USA. Eur. J. Mineral., Special Issue, pp. 1-9.
Mineral and/or Locality  
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