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Berthierine

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Berthierin
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Berthierin
Bildbreite: 3 mm; Fundort:Mont Saint-Hilaire
Copyright: Stephan Wolfsried; Contribution: JHM
Location: Kanada/Québec, Provinz/Montérégie, Region/La Vallée-du-Richelieu RCM/Mont Saint-Hilaire/Poudrette Quarry (Demix Quarry; Uni-Mix Quarry; Desourdy Quarry)
Mineral: Berthierine
Image: 1122127622
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Berthierin

Bildbreite: 3 mm; Fundort:Mont Saint-Hilaire

Copyright: Stephan Wolfsried
Contribution: JHM 2005-07-23
Locality: Poudrette Quarry (Demix Quarry; Uni-Mix Quarry; Desourdy Quarry) / Mont Saint-Hilaire / La Vallée-du-Richelieu RCM / Montérégie, Region / Québec, Provinz / Kanada

Collectors Summary

Color braun grün, grün gelb, dunkelgrün
Streak color grünlichweiß
Lustre Perlglanz
Hardness (Mohs) 2.5
Cleavages deutlich
Crystal System monoklin, C2/m

Additional information / Summary

Es sind zwei Polytypen bekannt Berthierin-1M und Berthierin-1H (die Werte hier sind für den Polytyp -1M angeben)

Chemism

Chemical formula

(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4

Chemical composition

Aluminium, Eisen, Silicium, Sauerstoff, Wasserstoff

Unit weight: 362.52222356 u; Number of atoms in the formula: 18

Info

Empirical formula:

(Fe0.6Fe0.3Al0.1)3(Si0.75Al0.25)2O5(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.11

4

22.22

1.0079470

4.0317880

Oxygen

O

39.72

9

50.00

15.9994300

143.9948700

Aluminium

Al

5.95

0.8

4.44

26.9815382

21.5852306

Silicon

Si

11.62

1.5

8.33

28.0855300

42.1282950

Iron

Fe

41.59

2.7

15.00

55.8452000

150.7820400

Analysis wt%

SiO2 : 21.40, Al2O3 : 25.40, FeO : 37.40, MgO : 2.04, H2O : 12.02 (Ref: Clays & Clay Minerals 82)

Strunz 9th edition incl. updates

9.ED.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
D: Schichtsilikate (Phyllosilikate) mit [Kaolinit]-Schichten, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Serpentin-Gruppe

Lapis Classification

VIII/H.27-070

VIII: SILIKATE
H: Schichtsilikate
27: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Serpentin-Gruppe

Classification by Hölzel

9.EM.130

9: SILICATES
E: Phyllosilicates
M: Serpentine-Group
1: Berthierine-Group

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Kaolinite-Serpentine Group  ⇒ Serpentine subgroup

Optical Properties

Color

braun grün, grün gelb, dunkelgrün

Streak color

grünlichweiß

Diaphaneity (Transparency)

durchscheinend

Lustre

Perlglanz

max. Birefringence

0.030

Birefringence chart\! Berthierine title=Birefringence chart Berthierine

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

1.62

RI value γ / ε

1.65

Ri mean

1.635

2V angle

Biaxial (?) 4° ~

Pleochroism

farblos bis Schattierungen von grün

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group

C2/m

Cell parameters a (Å)

5.41

Cell parameters b (Å)

9.33

Cell parameters c (Å)

7.28

Cell parameters a/b or c/a

0.580

Cell parameters c/b

0.78

Cell parameters α

90°

Cell parameters β

104.50

Cell parameters γ

90°

Z

2

Volume (ų)

355.756

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.37 (berechnet)

3.384 ( ρ calc. Mineralienatlas )

Cleavages

deutlich

Preface

Name from

Pierre Berthier (1782-1861), französischer Chemiker und Mineraloge

Author (Name, Year)

Beudant 1832

References

Mineralogical Magazine 29, 502-525.

Brindley, G.W. and R.F. Youell - Ferrous chamosite and ferric chamosite. Mineral. Mag. 37 (1953), 57-70.

Brindley, G.W. - Chemical composition of berthierines - a review. Clays and Clay Minerals 30 (1982), 153-155.

Arma, M., Fleet, ME., and Barnett, R.L. - Titanian berthierine: a Ti-rich serpentine group mineral from the Picton ultramafic dyke, Ontario. Canadian Mineralogist 23 (1985), 213-220.

Bertoldi, C., Dachs, E., Cemič, L., Theye, T., Wirth, R., and Groger, W. - The heat capacity of the serpentine-subgroup mineral berthierine (Fe2.5Al0.5) [Si1.5Al0.5O5](OH)4. Clays and Clay Minerals 53 (2005), 381-389.

IMA group assignments

Other languages

German

Berthierin

Spanish

Berthierina

French

Berthierine

English

Berthierine

Russian

Бертьерин

Simplified Chinese

铁铝蛇纹石

Alternative Name

English

Berthierine-1M

K-type Chamosite

German

Septechamosit

Spanish

Septechamosita

Septechamosite

CNMNC symbol

Symbol

Brh

Locations with GPS information

IDs

GUSID (Global unique identifier short form) D8ULVOX9BkCk5z-n89CyQw
GUID (Global unique identifier) 540BC50F-FDE5-4006-A4E7-3FA7F3D0B243
Database ID 372