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Gaultite (Gaultit)

Collectors Summary

Color farblos, blass mauve
Streak color weiß
Hardness (Mohs) 6
Cleavages vollkommen {101} und {010}, undeutlich {021}
Fracture muschelig
Solubility + 1:1 HCl
Crystal System orthorhombisch, F2dd

Chemism

Chemical formula

Na4Zn2Si7O18·5H2O

Chemical composition

Natrium, Silicium, Zink, Sauerstoff, Wasserstoff

Unit weight: 797.4429508 u; Number of atoms in the formula: 46

Info

Empirical formula:

Na4Zn2Si7O18·5H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.26

10

21.74

1.0079470

10.0794700
Oxygen

O

46.15

23

50.00

15.9994300

367.9868900
Sodium

Na

11.53

4

8.70

22.9897702

91.9590808
Silicon

Si

24.65

7

15.22

28.0855300

196.5987100
Zinc

Zn

16.40

2

4.35

65.4094000

130.8188000

Analysis wt%

Ø Na2O : 16.60, ZnO : 19.20, SiO2 : 52.60, H2O : 11.30 (Ref: Canadian Mineralogist 94)

Strunz 9th edition incl. updates

9.GF.20

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
F: [Leucit]-Typ-Gerüste
20:Gaultit-Gruppe

Lapis Classification

VIII/J.17-020

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
17: Gerüstsilikate mit Zeolithstruktur

Classification by Hölzel

9.FO.140

9: SILICATES
F: Tektosilicates
O: Zeolites with unknown Structure

Dana 8th edition

77.02.06.01

77: Tektosilicates Tectosilicate Zeolite group
02: Tektosilicates Tectosilicate Zeolite group related species

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Zeolite group  ⇒ VSV zeolite structure group

Optical Properties

Color

farblos, blass mauve

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.004
Birefringence chart\! Gaultite title=Birefringence chart Gaultite

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

1.520

RI value β

1.521

RI value γ / ε

1.524

Ri mean

1.522

2V angle

Biaxial (+) 61°

Optical Data Luminescence

Luminescence

fluoreszierend, Kurzwelliges UV=hellgrün

Color LW-UV (365nm)

  

grün

LW-UV Intensity

stark

Color SW-UV (254nm)

  

grün

SW-UV Intensity

stark

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

43

Space Group

F2dd

Cell parameters a (Å)

10.211

Cell parameters b (Å)

39.88

Cell parameters c (Å)

10.304

Cell parameters a/b or c/a

0.256

Cell parameters c/b

0.258

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

4195.94

X-Ray Powder Diffraction

6.35(100),
5.36(20),
4.96(30),
3.240(60),
3.167(40),
3.140(40),
2.996(20),
2.821(30)
XRD chart Gaultite

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)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.52

2.525 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {101} und {010}, undeutlich {021}

Fracture

muschelig

Tenacity

spröde

Instability

+ 1:1 HCl

(Co-)Type locality

(Co-)Type locality

Kanada/Québec/Montérégie, Region/La Vallée-du-Richelieu RCM/Mont Saint-Hilaire/Poudrette Quarry (Demix Quarry; Uni-Mix Quarry; Desourdy Quarry)

Preface

Author (Name, Year)

Ercit & Van Velthuizen, 1994

References

Canadian Mineralogist 32 (1994), 855

IMA group assignments

Other languages

German

Gaultit

Spanish

Gaultita

English

Gaultite

French

Gaultite

Russian

Голтит

CNMNC (IMA)-Number

IMA 1992-040

CNMNC symbol

Symbol

Gau

Locations with GPS information