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Brannockite (Brannockit)

Pictures (4 Images total)

Brannockit
Views (File:
1166276793
): 1429
Brannockit
Bildbreite: 3 mm; Fundort Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/North Carolina/Cleveland Co./Kings Mountain District/Foote Mine (Foote Lithium Co. Mine)
Mineral: Brannockite
Image: 1166276793
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Brannockit

Bildbreite: 3 mm; Fundort Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Stephan Wolfsried
Contribution: Hg 2006-12-16
Locality: Foote Mine (Foote Lithium Co. Mine) / Kings Mountain District / Cleveland Co. / North Carolina / USA
Brannockit
Views (File:
1282584009
): 797
Brannockit
Kristallgröße: 2,3 mm, Fundort: Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Jason B. Smith; Contribution: thdun5
Location: USA/North Carolina/Cleveland Co./Kings Mountain District/Foote Mine (Foote Lithium Co. Mine)
Mineral: Brannockite
Image: 1282584009
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Brannockit

Kristallgröße: 2,3 mm, Fundort: Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Jason B. Smith
Contribution: thdun5 2010-08-23
Locality: Foote Mine (Foote Lithium Co. Mine) / Kings Mountain District / Cleveland Co. / North Carolina / USA
Brannockit
Views (File:
1387559113
): 704
Brannockit
Tafelige farblose Kristalle, Quarz, BB = 3,5 mm, Fundort: Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A009428, Donator: Manfred Seitz
Location: USA/North Carolina/Cleveland Co./Kings Mountain District/Foote Mine (Foote Lithium Co. Mine)
Mineral: Brannockite
Image: 1387559113
License: Usage for Mineralienatlas project only
Brannockit (SNr: A009428)

Tafelige farblose Kristalle, Quarz, BB = 3,5 mm, Fundort: Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA.
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2013-12-20
Locality: Foote Mine (Foote Lithium Co. Mine) / Kings Mountain District / Cleveland Co. / North Carolina / USA
Brannockit
Views (File:
1410353355
): 492
Brannockit
Bildbreite: 2 mm, Fundort: Foote Lithium Co. Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/North Carolina/Cleveland Co./Kings Mountain District/Foote Mine (Foote Lithium Co. Mine)
Mineral: Brannockite
Image: 1410353355
License: Usage for Mineralienatlas project only
Brannockit

Bildbreite: 2 mm, Fundort: Foote Lithium Co. Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Stephan Wolfsried
Contribution: Hg 2014-09-10
Locality: Foote Mine (Foote Lithium Co. Mine) / Kings Mountain District / Cleveland Co. / North Carolina / USA

You find additional Brannockit specimen at the Geolitho Museum

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 5 - 6
Crystal System hexagonal, P6/mcc

Chemism

Chemical formula

KSn2Li3Si12O30

Chemical composition

Lithium, Silicium, Zinn, Kalium, Sauerstoff

Unit weight: 1114.35257 u; Number of atoms in the formula: 48

Info

Empirical formula:

KSn2Li3Si12O30

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Lithium

Li

1.87

3

6.25

6.9412000

20.8236000
Oxygen

O

43.07

30

62.50

15.9994300

479.9829000
Silicon

Si

30.24

12

25.00

28.0855300

337.0263600
Potassium

K

3.51

1

2.08

39.0983100

39.0983100
Tin

Sn

21.31

2

4.17

118.7107000

237.4214000

Analysis wt%

K2O : 3.72, Li2O : 3.75, Na2O : 0.74, SnO2 : 28.20, SiO2 : 65.80 (Ref: Mineralogical Record 73)

Strunz 9th edition incl. updates

9.CM.05

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
M: ~[Si6O18]12- sechser-Doppelringe
05:Milarit-Gruppe

Lapis Classification

VIII/E.22-140

VIII: SILIKATE
E: Ringsilikate
22: Doppelte Sechserringe [Si12O30] 12-; Milarit/Osumilith-Gruppe

Classification by Hölzel

9.CF.320

9: SILICATES
C: Cyclosilicates
F: ~[Si12O30]12--Rings Milarite-Group

Dana 8th edition

63.02.01a.01

63: Cyclosilicates Cyclosilicate Condensed Rings
02: Cyclosilicates Cyclosilicate Condensed Rings 6-membered rings
01a: Milarite - Osumilite group (Milarite - Osumilite subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Osumilite Group

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.001
Birefringence chart\! Brannockite title=Birefringence chart Brannockite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.567

RI value γ / ε

1.566

Ri mean

1.567

2V angle

Uniaxial (-)

Optical Data Luminescence

Color SW-UV (254nm)

  

bläulich weiß

SW-UV Intensity

stark

Afterglow (Persistant Luminescence)

keine Daten

Image ⇒ Luminescence ⇒ excitation ⇒ UV shortwave ~254nm (1 Images total)

Brannockit
Views (File:
1282583986
): 622
Brannockit
Brannockit unter kurzwelligem UV, Kristallgröße: 0,5 mm, Fundort: Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Jason B. Smith; Contribution: thdun5
Location: USA/North Carolina/Cleveland Co./Kings Mountain District/Foote Mine (Foote Lithium Co. Mine)
Mineral: Brannockite
Image: 1282583986
License: Usage for Mineralienatlas project only
Brannockit

Brannockit unter kurzwelligem UV, Kristallgröße: 0,5 mm, Fundort: Foote Mine, Kings Mountain District, Cleveland Co., North Carolina, USA
Copyright: Jason B. Smith
Contribution: thdun5 2010-08-23
Locality: Foote Mine (Foote Lithium Co. Mine) / Kings Mountain District / Cleveland Co. / North Carolina / USA

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

192

Space Group

P6/mcc

Cell parameters a (Å)

10.017

Cell parameters b (Å)

-

Cell parameters c (Å)

14.245

Cell parameters a/b or c/a

1.422

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volumne (ų)

1237.851

X-Ray Powder Diffraction

8.693(60),
7.141(80),
5.504(70),
4.337(80),
4.109(100),
2.905(90),
2.681(60),
2.502(60)
XRD chart Brannockite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5 - 6

Density (g/cm³)

2.98 (gemessen)

2.99 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/North Carolina/Cleveland Co./Kings Mountain District/Foote Mine (Foote Lithium Co. Mine)

Preface

Author (Name, Year)

White & Arem & Nelen & Leavens & Thomssen, 1973

References

Mineralogical Record 4 (1973), 73

IMA group assignments

Other languages

German

Brannockit

Spanish

Brannockita

French

Brannockite

English

Brannockite

Russian

Бреннокит

CNMNC (IMA)-Number

IMA 1972-029

CNMNC symbol

Symbol

Bra

Locations with GPS information