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Ganterite

Pictures (1 Images total)

Ganterit xx (Glimmerartige Täfelchen)
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Ganterit xx (Glimmerartige Täfelchen)
Wasenalp Gantertal Simplongebiet Wallis Schweiz. BB=15mm.
Copyright: pilzpirat; Contribution: pilzpirat
Collection: pilzpirat
Location: Schweiz/Wallis, Kanton/Brig, Bezirk/Simplonpassgebiet/Gantertal/Wasenalp
Mineral: Ganterite
Image: 1331488809
License: Usage for Mineralienatlas project only
Ganterit xx (Glimmerartige Täfelchen)

Wasenalp Gantertal Simplongebiet Wallis Schweiz. BB=15mm.
Collection: pilzpirat
Copyright: pilzpirat
Contribution: pilzpirat 2012-03-11
Locality: Wasenalp / Gantertal / Simplonpassgebiet / Brig, Bezirk / Wallis, Kanton / Schweiz

Collectors Summary

Color hellgrau, silber
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4 - 4.5
Cleavages vollkommen {001}
Fracture lamellar
Crystal System monoklin, C2/c

Chemism

Chemical formula

(Ba,Na,K)(Al,Mg)2[(OH,F)2|(Al,Si)Si2O10]

Chemical composition

Aluminium, Barium, Magnesium, Natrium, Silicium, Fluor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 424.261382635 u; Number of atoms in the formula: 19.5

Info

Empirical formula:

(Ba0.6Na0.3K0.1)(Al0.75Mg0.25)2[((OH)0.75F0.25)2(Al0.75Si0.25)Si2O10]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.36

1.5

7.69

1.0079470

1.5119205
Oxygen

O

43.37

11.5

58.97

15.9994300

183.9934450
Fluorine

F

2.24

0.5

2.56

18.9984033

9.4992016
Sodium

Na

1.63

0.3

1.54

22.9897702

6.8969311
Magnesium

Mg

2.86

0.5

2.56

24.3050600

12.1525300
Aluminium

Al

14.31

2.25

11.54

26.9815382

60.7084610
Silicon

Si

14.89

2.25

11.54

28.0855300

63.1924425
Potassium

K

0.92

0.1

0.51

39.0983100

3.9098310
Barium

Ba

19.42

0.6

3.08

137.3277000

82.3966200

Analysis wt%

SiO2 : 37.47, TiO2 : 0.73, Al2O3 : 36.50, FeO : 0.69, MgO : 0.86, BaO : 15.54, Na2O : 1.91, K2O : 3.02, H2O : 3.90 (Ref: Canadian Mineralogist 2003)

Strunz 9th edition incl. updates

9.EC.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Muskovit-Gruppe

Lapis Classification

VIII/H.10-095

VIII: SILIKATE
H: Schichtsilikate
10: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Seladonit/Muskovit-Reihe (Phengite)

Classification by Hölzel

9.EC.270

9: SILICATES
E: Phyllosilicates
C: Micas-Group

IMA status

anerkannt 2000

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Mica group  ⇒ True micas

Optical Properties

Color

hellgrau, silber

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.022
Birefringence chart\! Ganterite title=Birefringence chart Ganterite

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

1.600

RI value β

1.619

RI value γ / ε

1.622

Ri mean

1.614

2V angle

Biaxial (-) 43°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

5.212

Cell parameters b (Å)

9.046

Cell parameters c (Å)

19.978

Cell parameters a/b or c/a

0.576

Cell parameters c/b

2.208

Cell parameters α

90°

Cell parameters β

95.80

Cell parameters γ

90°

Z

4

Volume (ų)

937.096

X-Ray Powder Diffraction

4.481(70),
3.887(80),
3.737(80),
3.495(70),
3.199(70),
2.602(90),
2.571(100),
1.5054(90)
XRD chart Ganterite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

4 - 4.5

VHN (Hardness Vickers)

260 (100g)

Density (g/cm³)

3.11 (berechnet)

3.007 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Fracture

lamellar

Tenacity

flexibel

(Co-)Type locality

(Co-)Type locality

Schweiz/Wallis, Kanton/Brig, Bezirk/Simplonpassgebiet/Gantertal/Wasenalp/Isenwegg

Preface

Name from

Typlokalität

Author (Name, Year)

Graeser & Hetherington & Gieré, 2003

References

Graeser S., Hetherington C.J., Gieré R. - Ganterite, a new barium-dominant analogue of muscovite from the Berisal Complex, Simplon Region, Switzerland - Canadian Mineralogist 41 (2003), 1271-1280.

Hetherington C.J., R. Giere and S. Graeser - Composition of barium-rich white micas from the Berisal Complex, Smon Regon, Switzerland - Canadian Mineralogist 41 (2003), 1281-1291.

American Mineralogist 89 (2004), 1827.

Ma, Chi & George R. Rossman - Ganterite, the barium mica Ba0.5K0.5Al2(Al1.5Si2.5)O10(OH)2, from Oreana, Nevada. American Mineralogist - American Mineralogist 91 (2006), 702-705.

IMA group assignments

 
Mica group
 
 
 

 
 
True micas
 
 
 

 
 
 
Aluminoceladonite
K(Mg,Fe2+)Al[(OH)2|Si4O10]
monoklin
 

 
 
 
Annite
KFe2+3(Si3Al)O10(OH,F)2
monoklin
C2/m

 
 
 
Aspidolite
NaMg3(AlSi3)O10(OH)2
monoklin
C2/m

 
 
 
Boromuscovite
KAl2(Si3B)O10(OH,F)2
monoklin
C2/m

 
 
 
Celadonite
K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2
monoklin
C2

 
 
 
Chromphyllite
K(Cr,Al)2[(OH,F)2|AlSi3O10]
monoklin
C2/c

 
 
 
Eastonite
KMg2Al[(OH)2|Al2Si2O10]
monoklin
C2

 
 
 
Ephesite
NaLiAl2(Al2Si2)O10(OH)2
monoklin
Cc

 
 
 
Ferroaluminoceladonite
K(Fe2+,Mg)(Al,Fe3+)[(OH)2|Si4O10]
monoklin
C2/m

 
 
 
Ferroceladonite
K(Fe2+,Mg)(Fe3+,Al)[(OH)2|Si4O10]
monoklin
C2/m

 
 
 
Fluorannite
KFe32+[(F,OH)2|AlSi3O10]
monoklin
C2/m

 
 
 
Ganterite
(Ba,Na,K)(Al,Mg)2[(OH,F)2|(Al,Si)Si2O10]
monoklin
C2/c

 
 
 
Hendricksite
K(Zn,Mn)3Si3AlO10(OH)2
monoklin
C2/m

 
 
 
Masutomilite
K(Li,Al,Mn2+)3(Si,Al)4O10(F,OH)2
monoklin
C2

 
 
 
Montdorite
KMn0.52+Fe1.52+Mg0.5[F2|Si4O10]
monoklin
C2/m

 
 
 
Muscovite
KAl2(Si3Al)O10(OH,F)2
monoklin
C2/c

 
 
 
Nanpingite
CsAl2(Si,Al)4O10(OH,F)2
monoklin
C2/c

 
 
 
Norrishite
KLiMn3+2Si4O12
monoklin
C2/m

 
 
 
Paragonite
NaAl2(Si3Al)O10(OH)2
monoklin
C2/c

 
 
 
Phlogopite
KMg3(Si3Al)O10(F,OH)2
monoklin
C2/m

 
 
 
Polylithionite
KLi2AlSi4O10(F,OH)2
monoklin
C2/m

 
 
 
Preiswerkite
NaMg2Al3Si2O10(OH)2
monoklin
C2/m

 
 
 
Roscoelite
K(V,Al,Mg)2AlSi3O10(OH)2
monoklin
C2/m

 
 
 
Shirozulite
K(Mn2+,Mg)3[(OH)2|AlSi3O10]
 
 

 
 
 
Siderophyllite
KFe22+Al(Al2Si2)O10(F,OH)2
monoklin
C2/m

 
 
 
Sokolovaite
CsLi2AlSi4O10F2
monoklin
 

 
 
 
Tainiolite
KLiMg2Si4O10F2
monoklin
C/2m

 
 
 
Tetraferriannite
KFe2+3(Si3Fe3+)O10(OH)2
monoklin
C2/m

 
 
 
Tetraferriphlogopite
KMg3[(F,OH)2|(Al,Fe3+)Si3O10]
monoklin
C2/m

 
 
 
Tobelite
(NH4,K)Al2(Si3Al)O10(OH)2
monoklin
C2/m

 
 
 
Trilithionite
KLi1.5Al1.5[F2|AlSi3O10]
monoklin
C2/m

 
 
 
Yangzhumingite
KMg2.5Si4O10F2
monoklin
C2/m

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Actuality: 05. Dec 2023 - 17:53:26

Other languages

German

Ganterit

English

Ganterite

Russian

Гантерит

Traditional Chinese

鋇雲母

Simplified Chinese

钡云母

CNMNC (IMA)-Number

IMA 2000-033

CNMNC symbol

Symbol

Gtr

Locations with GPS information

IDs

GUSID (Global unique identifier short form) LrTbddU0c0STwoxVug2Ydw
GUID (Global unique identifier) 75DBB42E-34D5-4473-93C2-8C55BA0D9877
Database ID 1331