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Gmelinite-K

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Gmelinit-K
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Gmelinit-K
Größe: 2 mm; Fundort: Fara Vicentino, Vicenza, Venetien (Veneto), Italien
Copyright: Matteo Chinellato; Contribution: Hg
Location: Italien/Venetien (Veneto), Region/Vicenza, Provinz/Fara Vicentino
Mineral: Gmelinite-K
Image: 1218527221
Rating: 8 (votes: 2)
License: Usage for Mineralienatlas project only
Gmelinit-K

Größe: 2 mm; Fundort: Fara Vicentino, Vicenza, Venetien (Veneto), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2008-08-12
Locality: Fara Vicentino / Vicenza, Provinz / Venetien (Veneto), Region / Italien

Collectors Summary

Color farblos, bräunlich weiß
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4 - 4.5
Fracture muschelig
Solubility +++ 10% HCl
Crystal System hexagonal, P63/mmc

Chemism

Chemical formula

(K,Na,Ca)5(Si,Al)24O48·22H2O

Chemical composition

Aluminium, Calcium, Natrium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 2003.5573225 u; Number of atoms in the formula: 143

Info

Empirical formula:

(K0.6Na0.3Ca0.1)5(Si0.75Al0.25)24O48·22H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.21

44

30.77

1.0079470

44.3496680

Oxygen

O

55.90

70

48.95

15.9994300

1,119.9601000

Sodium

Na

1.72

1.5

1.05

22.9897702

34.4846553

Aluminium

Al

8.08

6

4.20

26.9815382

161.8892292

Silicon

Si

25.23

18

12.59

28.0855300

505.5395400

Potassium

K

5.85

3

2.10

39.0983100

117.2949300

Calcium

Ca

1.00

0.5

0.35

40.0784000

20.0392000

Analysis wt%

SiO2 : 50.54, Al2O3 : 18.53, CaO : 1.56, Na2O : 2.63, K2O : 7.54, H2O : 19.20 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2001)

Strunz 9th edition incl. updates

9.GD.05

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
D: Ketten von fünfer-Ringen
05:Gmelinit-Gruppe

Lapis Classification

VIII/J.26-052

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
26: Zeolith-Gruppe; Würfelzeolithe

Classification by Hölzel

9.FL.223

9: SILICATES
F: Tektosilicates
L: Zeolites with 6-Rings

Dana 8th edition

77.01.02.06b

77: Tektosilicates Tectosilicate Zeolite group
01: Tektosilicates Tectosilicate Zeolite group true zeolites
02: Chabazite and related species

IMA status

anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Zeolite group  ⇒ GME zeolite structure group  ⇒ Gmelinite series

Optical Properties

Color

farblos, bräunlich weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.005

Birefringence chart\! Gmelinite-K title=Birefringence chart Gmelinite-K

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

1.472

RI value γ / ε

1.477

Ri mean

1.474

2V angle

Uniaxial (-)

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

194

Space Group

P63/mmc

Cell parameters a (Å)

13.696

Cell parameters b (Å)

-

Cell parameters c (Å)

10.203

Cell parameters a/b or c/a

0.745

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volume (ų)

1657.471

X-Ray Powder Diffraction

11.9(80),
7.8(50),
5.16(70),
4.11(100),
3.27(70),
2.971(80),
2.852(80),
2.719(100)

XRD chart Gmelinite-K

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)

4 - 4.5

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2

2.007 ( ρ calc. Mineralienatlas )

Fracture

muschelig

Tenacity

spröde

Instability

+++ 10% HCl

Preface

Author (Name, Year)

Khomyakov & Polezhaeva & Malinovskiy, 2001

References

Soviet Physics, Crystallography 29 (1984), 256.

Neues Jahrbuch für Mineralogie, Monatshefte (1990), 504.

Canadian Mineralogist 35 (1997), 1571.

Doklady Akademiia Nauk (in russisch) 368 (1999), 636

Zapiski Vserossiskogo Mineralogicheskogo Obshchetstva 130 (2001) (3), 65-71.

American Mineralogist 87 (2002), 1510.

IMA group assignments

Other languages

German

Gmelinit-K

Spanish

Gmelinita-K

English

Gmelinite-K

French

Gmelinite-K

Russian

Гмелинит-K

Simplified Chinese

钾菱沸石

Alternative Name

Gmelinit-(K)

Gmelinite-(K)

CNMNC (IMA)-Number

IMA 1999-039

CNMNC symbol

Symbol

Gme-K

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Qei_43tL8EOrIc7ZKUBT7A
GUID (Global unique identifier) E3BFE841-4B7B-43F0-AB21-CED9294053EC
Database ID 1408