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Gaultite

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

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

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Gaultit
Google-Bilder-Suche - search for: Gaultit
Mineralienatlas.de (Forum) - search for: Gaultit

English pages

Mindat - search for: Gaultite
Webmineral - search for:Gaultite
Handbook-of-Mineralogy - search for: Gaultite
RRUFF - Raman, XRD and other mineral data - search for: Gaultite
RRUFF - References and PDF downloads - search for: Gaultite
American-Mineralogist-Crystal-Structure-Database - search for: Gaultite
Strahlen.org - search for: Gaultite

Russian pages

Webmineral.ru - search for: Голтит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Gaultit
Crystal-Treasure.com - search for: Gaultit
Bosse - search for: Gaultit
Edelsteine Neuburg - Gundolf Fischer - search for: Gaultit

Locations with GPS information