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Panunzite (Panunzit)

Collectors Summary

Color farblos, weiß
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5.5
Crystal System hexagonal, P63

Chemism

Chemical formula

K3Na(AlSiO4)4

Chemical composition

Aluminium, Natrium, Silicium, Kalium, Sauerstoff

Unit weight: 616.543853 u; Number of atoms in the formula: 28

Info

Empirical formula:

K3Na(AlSiO4)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

41.52

16

57.14

15.9994300

255.9908800
Sodium

Na

3.73

1

3.57

22.9897702

22.9897702
Aluminium

Al

17.51

4

14.29

26.9815382

107.9261528
Silicon

Si

18.22

4

14.29

28.0855300

112.3421200
Potassium

K

19.02

3

10.71

39.0983100

117.2949300

Analysis wt%

SiO2 : 39.60, Al2O3 : 31.90, CaO : 0.43, Na2O : 5.74, K2O : 21.52 (Ref: American Mineralogist 88)

Strunz 9th edition incl. updates

9.FA.05

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen]
05:Nephelin-Gruppe

Lapis Classification

VIII/J.02-040

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
2: Ohne tetraederfremde Anionen

Classification by Hölzel

9.FA.230

9: SILICATES
F: Tektosilicates
A: Without other tetrahedral Anions

Dana 8th edition

76.02.01.04

76: Tektosilicates Tectosilicate Al-Si Framework
02: Tektosilicates Tectosilicate Al-Si Framework Feldspathoids and related species
01: Nepheline group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.005
Birefringence chart\! Panunzite title=Birefringence chart Panunzite

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

1.535

RI value γ / ε

1.540

Ri mean

1.537

2V angle

Uniaxial (-)

Crystallography

Crystal System

hexagonal

Class (H-M)

6

Space Group number

173

Space Group

P63

Cell parameters a (Å)

20.513

Cell parameters b (Å)

-

Cell parameters c (Å)

8.553

Cell parameters a/b or c/a

0.417

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

8

Volumne (ų)

3116.789

X-Ray Powder Diffraction

4.277(20),
3.929(70),
3.071(100),
2.914(30),
2.558(40),
2.380(20),
2.268(20),
2.177(20)
XRD chart Panunzite

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)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.59

2.628 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Monte Somma

Preface

Author (Name, Year)

Franco & Gennaro, 1988

References

American Mineralogist 73 (1988), 420

Other languages

German

Panunzit

Spanish

Panunzita

English

Panunzite

French

Panunzite

Russian

Панунцит

Alternative Name

English

Tetrakalsilite

CNMNC (IMA)-Number

IMA 1978-050

CNMNC symbol

Symbol

Pnz

Locations with GPS information