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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

Volumne (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

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

 
 
 
 

 
 
 
 
 

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

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

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

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

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

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

 
 
 
KMg2Al[(OH)2|Al2Si2O10]
monoklin
C2

 
 
 
NaLiAl2(Al2Si2)O10(OH)2
monoklin
Cc

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

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

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

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

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

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

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

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

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

 
 
 
KLiMn3+2Si4O12
monoklin
C2/m

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

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

 
 
 
KLi2AlSi4O10(F,OH)2
monoklin
C2/m

 
 
 
NaMg2Al3Si2O10(OH)2
monoklin
C2/m

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

 
 
 
K(Mn2+,Mg)3[(OH)2|AlSi3O10]
 
 

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

 
 
 
CsLi2AlSi4O10F2
monoklin
 

 
 
 
KLiMg2Si4O10F2
monoklin
C/2m

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

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

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

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

 
 
 
KMg2.5Si4O10F2
monoklin
C2/m

Refresh list

Actuality: 31. Jan 2023 - 20:47:28

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

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