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Preiswerkite

Pictures (2 Images total)

Preiswerkit (hellgrün)
Views (File:
1522595854
): 407
Preiswerkit (hellgrün)
Geisspfad-Pass; Binn, Goms, Bezirk; Wallis, Schweiz. BB:35mm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Schweiz/Wallis, Kanton/Goms, Bezirk/Binn/Geisspfad-Gebiet/Geisspfad-Pass
Mineral: Preiswerkite
Image: 1522595854
License: Usage for Mineralienatlas project only
Preiswerkit (hellgrün)

Geisspfad-Pass; Binn, Goms, Bezirk; Wallis, Schweiz. BB:35mm.

Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2018-04-01
Locality: Geisspfad-Pass / Geisspfad-Gebiet / Binn / Goms, Bezirk / Wallis, Kanton / Schweiz
Preiswerkit
Views (File:
1271613553
): 1538, Rating: 2.5
Preiswerkit
Bildbreite: 4 mm, Fundort: Geisspfad-Pass, Binntal, Wallis, Schweiz.
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Schweiz/Wallis, Kanton/Goms, Bezirk/Binn/Geisspfad-Gebiet/Geisspfad-Pass
Mineral: Preiswerkite
Image: 1271613553
Rating: 2.5 (votes: 4)
License: Usage for Mineralienatlas project only
Preiswerkit

Bildbreite: 4 mm, Fundort: Geisspfad-Pass, Binntal, Wallis, Schweiz.

Copyright: Luigi Chiappino
Contribution: thdun5 2010-04-18
Locality: Geisspfad-Pass / Geisspfad-Gebiet / Binn / Goms, Bezirk / Wallis, Kanton / Schweiz

Collectors Summary

Color grünlichweiß, hellgrün
Streak color weiß
Hardness (Mohs) 2.5
Crystal System monoklin, C2/m

Chemism

Chemical formula

NaMg2Al3Si2O10(OH)2

Chemical composition

Aluminium, Magnesium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 402.7246188 u; Number of atoms in the formula: 22

Info

Empirical formula:

NaMg2Al3Si2O10(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.50

2

9.09

1.0079470

2.0158940

Oxygen

O

47.67

12

54.55

15.9994300

191.9931600

Sodium

Na

5.71

1

4.55

22.9897702

22.9897702

Magnesium

Mg

12.07

2

9.09

24.3050600

48.6101200

Aluminium

Al

20.10

3

13.64

26.9815382

80.9446146

Silicon

Si

13.95

2

9.09

28.0855300

56.1710600

Strunz 9th edition incl. updates

9.EC.20

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

Lapis Classification

VIII/H.11-140

VIII: SILIKATE
H: Schichtsilikate
11: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Lithionit/Biotit-Reihe

Classification by Hölzel

9.EE.120

9: SILICATES
E: Phyllosilicates
E: ~[(OH)2|Al2Si2O10] Margarite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Mica group  ⇒ True micas

Optical Properties

Color

grünlichweiß, hellgrün

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.055

Birefringence chart\! Preiswerkite title=Birefringence chart Preiswerkite

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

1.560

RI value β

1.614

RI value γ / ε

1.615

Ri mean

1.596

2V angle

Biaxial (-) 6°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

5.228

Cell parameters b (Å)

9.049

Cell parameters c (Å)

9.819

Cell parameters a/b or c/a

0.578

Cell parameters c/b

1.085

Cell parameters α

90°

Cell parameters β

100.42

Cell parameters γ

90°

Z

2

Volumne (ų)

456.858

X-Ray Powder Diffraction

9.64(50),
4.52(60),
3.215(50),
2.775(50),
2.572(100),
2.457(70),
2.149(60),
1.508(100)

XRD chart Preiswerkite

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)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.96

2.927 ( ρ calc. Mineralienatlas )

Preface

Name from

H. Preiswerk (1876 - 1940), Professor in Basel

Author (Name, Year)

Keusen & Peters, 1980

References

H. R. Keusen, Tj. Peters, Preiswerkite, an Al-rich trioctahedral sodium mica from the Geisspfad ultramafic complex (Penninic Alps), American Mineralogist 65 (1980), 1134 - 1139

IMA group assignments

Other languages

German

Preiswerkit

Spanish

Preiswerkita

English

Preiswerkite

French

Preiswerkite

Russian

Прайсверкит

Alternative Name

Simplified Chinese

铝钠云母

Simplified Chinese

镁钠云母

CNMNC symbol

Symbol

Pwk

Locations with GPS information