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Petalite (Petalit)

Pictures (30 Images total)

Petalit
Views (Image: 1217258635): 5011, Rating: 8.5
Petalit

Größe: 2,3 cm; Catri, Sant'Ilario in Campo, San Piero in Campo, Campo nell'Elba, Insel Elba, Livorno, Toskana (Toscana), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2008-07-28
Petalite
Views (Image: 1435732090): 1690
Petalite

Single, a bit etched, petalite crystal, from Pomba pit, Serra das Éguas, Brumado, Bahia, Brazil; Size 48 х 26 х 19 mm

Collection: pegmatite
Copyright: pegmatite
Contribution: pegmatite 2015-07-01
Petalite
Views (Image: 1464282631): 1101
Petalite

XL, Naturally etched and gem quality, petalite crystal, from Palelni mine, Khetchel village, Molo quarter, Momeik Township, Kyaukme District, Shan State, Myanmar; Size 78 х 39 х 17 mm

Collection: pegmatite
Copyright: pegmatite
Contribution: pegmatite 2016-05-26
Petalit
Views (Image: 1220034186): 4756, Rating: 8
Petalit

Größe: 4,3 cm; Fundort: Gang San Silvestro, San Piero in Campo, Campo nell'Elba, Insel Elba, Livorno, Toskana (Toscana), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2008-08-29
Petalit
Views (Image: 1412064684): 1829
Petalit

Größe: 66,1 mm; Fundort: Gang San Silvestro, San Piero in Campo, Campo nell'Elba, Insel Elba, Livorno, Toskana (Toscana), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2014-09-30
Petalite
Views (Image: 1296123866): 1636
Petalite

Naturally etched petalite crystal, from Mogok, Sagaing District, Mandalay Division, Burma; Size 43 x 30 x 18 mm

Collection: pegmatite
Copyright: pegmatite
Contribution: pegmatite 2011-01-27

Collectors Summary

Color farblos, grau, gelb, gelb grau, weiß
Streak color farblos
Lustre Glasglanz, auf Bruchflächen auch Perlmuttglanz
Hardness (Mohs) 6.25
Solubility +++ HF
Crystal System monoklin, P2/a
Morphology säulig, tafelig, meistens korrodiert oder als derbe Aggregate

Chemism

Chemical formula

LiAlSi4O10

Chemical composition

Aluminium, Lithium, Silicium, Sauerstoff

Unit weight: 306.2591582 u; Number of atoms in the formula: 16

Info

Empirical formula:

LiAlSi4O10

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Lithium

Li

2.27

1

6.25

6.9412000

6.9412000

Oxygen

O

52.24

10

62.50

15.9994300

159.9943000

Aluminium

Al

8.81

1

6.25

26.9815382

26.9815382

Silicon

Si

36.68

4

25.00

28.0855300

112.3421200

Analysis wt%

SiO2 : 77.60, Al2O3 : 16.66, Li2O : 4.84, H2O : 0.58 (Ref: Canadian Mineralogist 72)

Strunz 9th edition incl. updates

9.EF.05

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
F: Einfache Netze aus sechsfach-Ringen, verbunden über M~[4], M~[8], etc.
05:Petalit-Gruppe

Lapis Classification

VIII/J.03-010

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

Classification by Hölzel

9.FA.300

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

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, grau, gelb, gelb grau, weiß

Streak color

farblos

Diaphaneity (Transparency)

transparent bis durchscheinend

Lustre

Glasglanz, auf Bruchflächen auch Perlmuttglanz

max. Birefringence

0.012

Birefringence chart\! Petalite title=Birefringence chart Petalite

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

1.504

RI value β

1.510

RI value γ / ε

1.516

Ri mean

1.510

2V angle

Biaxial (+) 83°

Optical Data Luminescence

Luminescence

schwach fluoreszierend

Color LW-UV (365nm)

 

gelblich weiß

Color SW-UV (254nm)

 

gelblich weiß

Afterglow (Persistant Luminescence)

keine Daten

Thermoluminescence

vorhanden

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

13

Space Group

P2/a

Cell parameters a (Å)

11.754

Cell parameters b (Å)

5.140

Cell parameters c (Å)

7.630

Cell parameters a/b or c/a

2.287

Cell parameters c/b

1.484

Cell parameters α

90°

Cell parameters β

113.3

Cell parameters γ

90°

Z

2

Volumne (ų)

423.377

X-Ray Powder Diffraction

3.734(100),
3.725(100),
3.673(70),
3.649(70),
3.510(30),
2.570(10),
2.058(10),
1.934(20)

XRD chart Petalite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

säulig, tafelig, meistens korrodiert oder als derbe Aggregate

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.25

VHN (Hardness Vickers)

850 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.39 - 2.46 / Durchschnittlich = 2.42

2.402 ( ρ calc. Mineralienatlas )

Radioactivity

keine

Instability

+++ HF

(Co-)Type locality

(Co-)Type locality

Schweden/Södermanland, Provinz/Nyköping/Utö

Preface

Associations

Spodumen, Lepidolith und Turmalin

Rareness

Kristalle selten

Author (Name, Year)

d'Andrada, 1800

Relevance, Usage

gelegentlich als Schmuckstein verschliffen, auch als Petalit-Katzenauge

Additional Information

Name aus dem Griechischen (`Blatt`) wegen vollständiger Spaltbarkeit

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 641

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Petalite

LiAlSi4O10

monoklin : 2/m : P2/a

9.EF.05

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Petalite

LiAlSi4O10

monoklin : 2/m : P2/a

VIII/J.03-010

Virgilite

LixAlxSi3-xO6

hexagonal, hexagonal : 622, 622 : P6222, P6422

VIII/J.03-020

Lisitsynite

K[BSi2O6]

orthorhombisch : 222 : P212121

VIII/J.03-030

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Petalite

LiAlSi4O10

monoklin : 2/m : P2/a

9.FA.300

Chkalovite

Na2BeSi2O6

orthorhombisch : mm2 : Fdd2

9.FA.330

Other languages

Dutch

Petaliet

German

Petalit

Spanish

Petalita

French

Petalite

English

Petalite

Russian

Петалит

Ukrainian

Петаліт

Simplified Chinese

透锂长石

Alternative Name

Arfvedsonite (of Beudant)

Arfvedsonite (of Beudant)

Berzeliite (of Clarke)

Berzeliite (of Clarke)

Berzelite (of Clark)

Berzelite (of Clarke)

Castor

Castorit

Castorita

Castorite

Lithit

Lithita

Lithite

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

German pages

DeWikiPedia - search for: Petalit
Google-Bilder-Suche - search for: Petalit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Petalit

English pages

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

Russian pages

Webmineral.ru - search for: Петалит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Petalit
Crystal-Treasure.com - search for: Petalit
Bosse - search for: Petalit



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