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Orthochamosite

You find additional specimen at the Geolitho Museum

Collectors Summary

Color grün, grünlich grau
Streak color grünlichweiß
Hardness (Mohs) 2.5
Crystal System orthorhombisch,

Chemism

Chemical formula

(Fe2+,Mg,Fe3+)5Al(Si3Al)O10(OH,O)8

Chemical composition

Aluminium, Eisen, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 664.1728784 u; Number of atoms in the formula: 34

Info

Empirical formula:

(Fe0.6Mg0.3Fe0.1)5Al(Si3Al)O10((OH)0.75O0.25)8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.91

6

17.65

1.0079470

6.0476820
Oxygen

O

43.36

18

52.94

15.9994300

287.9897400
Magnesium

Mg

5.49

1.5

4.41

24.3050600

36.4575900
Aluminium

Al

8.12

2

5.88

26.9815382

53.9630764
Silicon

Si

12.69

3

8.82

28.0855300

84.2565900
Iron

Fe

29.43

3.5

10.29

55.8452000

195.4582000

Strunz 9th edition incl. updates

9.EC.55

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

Classification by Hölzel

9.EM.180

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

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Aberkannt, Polytyp von Chamosit - Bayliss P (1975) Nomenclature of the trioctahedral chlorites. The Canadian Mineralogist 13, 178-180

Mineral status

Polytype

Variety / polytype of

Chamosite

IMA Classification

IMA Classification

 Chlorite group

Optical Properties

Color

grün, grünlich grau

Streak color

grünlichweiß

Diaphaneity (Transparency)

durchscheinend

2V angle

Biaxial

Crystallography

Crystal System

orthorhombisch

Cell parameters a (Å)

5.37

Cell parameters b (Å)

9.31

Cell parameters c (Å)

7.06

Cell parameters a/b or c/a

0.577

Cell parameters c/b

0.758

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

1

Volumne (ų)

352.963

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.1 - 3.15 / Durchschnittlich = 3.12

3.124 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Tschechien/Mittelböhmen (Středočeský kraj)/Kuttenberg (Kutná Hora)/Kuttenberg (Kutná Hora)/Gang (Kank)

Tschechien/Mittelböhmen (Středočeský kraj)/Kuttenberg (Kutná Hora)/Kuttenberg (Kutná Hora)/Gang (Kank)/Dauerganger Erzzug (Turkanke pasmo)/Panska Schacht

Preface

Author (Name, Year)

Novak & Vtelensky & Losert & Kupa & Valcha, 1957

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 604

Name given to the ortho-hexagonal species first reported by Brindley (1951): Novák F, Vtelenský J, Losert J, Kupka F, Valcha Z (1957) The orthochamosite from the ore veins of Kank near Kutna Hora- a new specific mineral, Essays in honour of academician Frantis Slavik on the occasion of his eightieth birthday 1957, 315-344

Discreditiert da ein Polytyp von Chamosit: Bayliss P (1975) Nomenclature of the trioctahedral chlorites. The Canadian Mineralogist 13, 178-180

IMA group assignments

Other languages

German

Orthochamosit

English

Orthochamosite

French

Orthochamosite

Spanish

Ortochamosita

Alternative Name

Orthoberthierine

Spanish

Orthochamosita

Locations with GPS information

IDs

GUSID (Global unique identifier short form) PybCY_yjmkeqGwj6yjTLcQ
GUID (Global unique identifier) 63C2263F-A3FC-479A-AA1B-08FACA34CB71
Database ID 2844