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Petalite (Petalit)

Pictures (37 Images total)

Petalite
Views (File:
1547372614
): 1549
Petalite
Patterns of dissolving on the surface of the naturally etched, Petalite crystal from Palelni mine, Khetchel village, Molo quarter, Momeik Township, Kyaukme District, Shan State, Myanma
Copyright: pegmatite; Contribution: pegmatite
Location: Myanmar (Burma)/Shan-Staat/Kyaukme, Distrikt/Möng Mit (Momeik) Township/Khetchel (Cache; Khat Che)/Palelni Mine (Kat Chay Mine)
Mineral: Petalite
Encyclopedia: Ätzung
Image: 1547372614
Rating: 10 (votes: 1)
License: Usage for Mineralienatlas project only
Petalite

Patterns of dissolving on the surface of the naturally etched, Petalite crystal from Palelni mine, Khetchel village, Molo quarter, Momeik Township, Kyaukme District, Shan State, Myanma
Copyright: pegmatite
Contribution: pegmatite 2019-01-13
Locality: Palelni Mine (Kat Chay Mine) / Khetchel (Cache; Khat Che) / Möng Mit (Momeik) Township / Kyaukme, Distrikt / Shan-Staat / Myanmar (Burma)
Petalit
Views (File:
1217258635
): 6625, 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
Location: Italien/Toskana (Toscana)/Livorno, Provinz/Elba, Insel/Campo nell'Elba/Sant'Ilario in Campo/Catri
Mineral: Petalite
Image: 1217258635
Rating: 8.5 (votes: 4)
License: Usage for Mineralienatlas project only
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
Locality: Catri / Sant'Ilario in Campo / Campo nell'Elba / Elba, Insel / Livorno, Provinz / Toskana (Toscana) / Italien
Petalite
Views (File:
1435732090
): 3963
Petalite
Single, a bit etched, petalite crystal, from Pomba pit, Serra das Éguas, Brumado, Bahia, Brazil; Size 48 х 26 х 19 mm
Copyright: pegmatite; Contribution: pegmatite
Collection: pegmatite
Location: Brasilien/Nordosten (Região Nordeste)/Bahia/Brumado (Bom Jesus dos Meiras)/Serra das Éguas/Pomba
Mineral: Petalite
Image: 1435732090
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
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
Locality: Pomba / Serra das Éguas / Brumado (Bom Jesus dos Meiras) / Bahia / Nordosten (Região Nordeste) / Brasilien
Petalite
Views (File:
1464282631
): 2724
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
Copyright: pegmatite; Contribution: pegmatite
Collection: pegmatite
Location: Myanmar (Burma)/Shan-Staat/Kyaukme, Distrikt/Möng Mit (Momeik) Township/Khetchel (Cache; Khat Che)/Palelni Mine (Kat Chay Mine)
Mineral: Petalite
Image: 1464282631
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
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
Locality: Palelni Mine (Kat Chay Mine) / Khetchel (Cache; Khat Che) / Möng Mit (Momeik) Township / Kyaukme, Distrikt / Shan-Staat / Myanmar (Burma)
Petalit
Views (File:
1220034186
): 6417, 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
Location: Italien/Toskana (Toscana)/Livorno, Provinz/Elba, Insel/Campo nell'Elba/San Piero in Campo/Gang San Silvestro (Filone San Silvestro)
Mineral: Petalite
Encyclopedia: Ätzung
Image: 1220034186
Rating: 8 (votes: 5)
License: Usage for Mineralienatlas project only
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
Locality: Gang San Silvestro (Filone San Silvestro) / San Piero in Campo / Campo nell'Elba / Elba, Insel / Livorno, Provinz / Toskana (Toscana) / Italien

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

Volume (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

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

CNMNC symbol

Symbol

Ptl

Locations with GPS information

IDs

GUSID (Global unique identifier short form) mUsq4-BVq02ZzJRtzqjQig
GUID (Global unique identifier) E32A4B99-55E0-4DAB-99CC-946DCEA8D08A
Database ID 3006