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Petalite

Pictures (34 Images total)

Petalite
Views (Image: 1547372614): 1394
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 (Image: 1217258635): 6390, 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
Locality: Catri / Sant'Ilario in Campo / Campo nell'Elba / Elba, Insel / Livorno, Provinz / Toskana (Toscana) / Italien
Petalite
Views (Image: 1435732090): 3444
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 (Image: 1464282631): 2489
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 (Image: 1220034186): 6253, 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
Locality: Gang San Silvestro (Filone San Silvestro) / San Piero in Campo / Campo nell'Elba / Elba, Insel / Livorno, Provinz / Toskana (Toscana) / Italien
Petalit
Views (Image: 1412064684): 2187
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
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

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

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

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

German pages

DeWikiPedia - search for: Petalit
Google-Bilder-Suche - search for: Petalit
Mineralienatlas.de (Forum) - 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
Strahlen.org - 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
Edelsteine Neuburg - Gundolf Fischer - search for: Petalit

Locations with GPS information