Brannockite

Brannockite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA

Brannockite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA

Brannockite, etc.

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA

Brannockite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA

Brannockite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA

Brannockite, etc.

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA

Brannockite

Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA

Brannockite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA

About BrannockiteHide

Kent C. Brannock

Formula:

K◻₂Sn₂Li₃[Si₁₂O₃₀]

Colour:

Colorless

Lustre:

Vitreous

Hardness:

5 - 6

Specific Gravity:

2.98

Crystal System:

Hexagonal

Member of:

Osumilite Group

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).

Type Locality:

ⓘ Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA

One of two K-Li-Sn minerals (the other is aleksandrovite).

Unique IdentifiersHide

IMA Classification of BrannockiteHide

Classification of BrannockiteHide

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Physical Properties of BrannockiteHide

Optical Data of BrannockiteHide

Type:

Uniaxial (-)

RI values:

n_ω = 1.567 n_ε = 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

Chemistry of BrannockiteHide

Crystallography of BrannockiteHide

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0001158	Brannockite	Armbruster T, Oberhansli R (1988) Crystal chemistry of double-ring silicates: Structures of sugilite and brannockite American Mineralogist 73 595-600		1988		0	293
0001159	Brannockite	Armbruster T, Oberhansli R (1988) Crystal chemistry of double-ring silicates: Structures of sugilite and brannockite American Mineralogist 73 595-600		1988		0	293

CIF Raw Data - click here to closedata_global _chemical_name_mineral 'Brannockite' loop_ _publ_author_name 'Armbruster T' 'Oberhansli R' _journal_name_full 'American Mineralogist' _journal_volume 73 _journal_year 1988 _journal_page_first 595 _journal_page_last 600 _publ_section_title ; Crystal chemistry of double-ring silicates: Structures of sugilite and brannockite ; _database_code_amcsd 0001158 _chemical_formula_sum 'K Sn2 Li3 Si12 O30' _cell_length_a 10.002 _cell_length_b 10.002 _cell_length_c 14.263 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1235.706 _exptl_crystal_density_diffrn 2.995 _symmetry_space_group_name_H-M 'P 6/m c c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-x+y,1/2+z' 'x,x-y,1/2-z' '-x+y,-x,-z' 'x-y,x,z' '-y,-x,1/2+z' 'y,x,1/2-z' 'y,-x+y,-z' '-y,x-y,z' 'x-y,-y,1/2+z' '-x+y,y,1/2-z' 'x,y,-z' '-x,-y,z' 'x,x-y,1/2+z' '-x,-x+y,1/2-z' 'x-y,x,-z' '-x+y,-x,z' 'y,x,1/2+z' '-y,-x,1/2-z' '-y,x-y,-z' 'y,-x+y,z' '-x+y,y,1/2+z' 'x-y,-y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z K 0.00000 0.00000 0.25000 Sn 0.33333 0.66667 0.25000 Li 0.50000 0.50000 0.25000 Si 0.23866 0.35649 0.39057 O1 0.13180 0.39770 0.00000 O2 0.22370 0.28070 0.13420 O3 0.15980 0.50380 0.17260 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 K 0.01570 0.01570 0.00170 0.00785 0.00000 0.00000 Sn 0.00460 0.00460 0.00450 0.00230 0.00000 0.00000 Li 0.01900 0.01900 0.00800 0.01500 0.00000 0.00000 Si 0.00380 0.00410 0.00290 0.00220 0.00060 0.00110 O1 0.01900 0.01600 0.00300 0.00800 0.00000 0.00000 O2 0.00870 0.01280 0.01340 0.00810 0.00060 0.00040 O3 0.00770 0.00500 0.00720 0.00330 -0.00130 -0.00360

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Type Occurrence of BrannockiteHide

Synonyms of BrannockiteHide

Other Language Names for BrannockiteHide

Relationship of Brannockite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of BrannockiteHide

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Internet Links for BrannockiteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Tajikistan
Districts of Republican Subordination ⓘ Dara-i-Pioz Massif	Agakhanov et al. (2016)
USA (TL)
North Carolina Cleveland County Kings Mountain ⓘ Foote Lithium Co. Mine (TL)	White et al. (1973) +2 other references
Gaston County ⓘ LCA Mine ?
Washington Okanogan County Golden Horn Batholith ⓘ Washington Pass	Raschke (2015) +1 other reference