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Laurelite

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Laurelit
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Laurelit

Regellos verwachsene schneeweiße Nadeln bis etwa 3 mm Länge; Bildbreite: 9 mm; Fundort: Grand Reef Mine, Laurel Canyon, Klondyke, Aravaipa District, Pinaleño Mts, Graham Co., Arizona, USA

Copyright: Peter Haas
Contribution: Mineralienatlas 2005-04-18
Locality: Grand Reef Mine / Laurel Canyon / Grand Reef Area / Klondyke / Aravaipa District / Graham Co. / Arizona / USA

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2
Solubility zersetzt sich schnell in kalter HCl 1:1, sehr langsam in kaltemH2O
Crystal System hexagonal, P6

Chemism

Chem­ical formula

Pb7F12Cl2

Chem­ical com­po­si­tion

Blei, Chlor, Fluor

Unit weight: 1749.357239 u; Number of atoms in the formula: 21

Info

Empirical formula:

Pb7F12Cl2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Fluorine

F

13.03

12

57.14

18.9984033

227.9808390

Chlorine

Cl

4.05

2

9.52

35.4532000

70.9064000

Lead

Pb

82.91

7

33.33

207.2100000

1,450.4700000

Strunz 9th edi­tion incl. updates

3.DC.20

3: Halide (Fluoride, Chloride, Bromide, Iodide)
D: Oxihalide, Hydroxyhalide und verwandte Doppel-Halide
C: Mit [Pb] ([As], [Sb], [Bi]) ohne [Cu]
20:Laurelit-Gruppe

Lapis Clas­sifica­tion

III/A.08-050

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
A: Einfache Halogenide
8: Wasserfrei, Metall : Halogen = 1:2, 1:3

Clas­sifica­tion by Hölzel

3.EB.120

3: HALIDES
E: Halides with mostly Pb,As,Sb,Bi,Te
B: With Pb,Bi
1: Cotunnite-Group

Dana 8th edi­tion

09.02.10.01

09: Halide Minerals
02: Anhydrous and Hydrated Halides where A (X)2

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

max. Birefrin­gence

0.043

Birefringence chart\! Laurelite title=Birefringence chart Laurelite

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

1.903

RI value γ / ε

1.946

Ri mean

1.917

2V angle

Uniaxial (+)

Crystallography

Crystal Sys­tem

hexagonal

Class (H-M)

3m

Space Group number

174

Space Group

P6

Cell param­e­ters a (Å)

10.267

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

3.984

Cell param­e­ters a/b or c/a

0.388

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

120°

Z

1

Volumne (ų)

363.695

X-Ray Pow­der Diffrac­tion

3.33(100),
3.125(40),
2.949(40),
2.559(30),
2.090(30),
1.934(60),
1.812(30),
1.709(40)

XRD chart Laurelite

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)

2

VHN (Hard­ness Vick­ers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

7.65

7.987 ( ρ calc. Mineralienatlas )

Insta­bil­ity

zersetzt sich schnell in kalter HCl 1:1, sehr langsam in kaltemH2O

Preface

Author (Name, Year)

Kampf & Dunn & Foord, 1989

Addi­tional Informa­tion

Entdeckungsjahr: 1989

References

American Mineralogist 74 (1989), 927

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

Laurelite

Pb7F12Cl2

hexagonal : 3m : P6

3.DC.20

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

Fluorite

CaF2

kubisch : m3m : Fm3m

III/A.08-010

Strontiofluorite

SrF2

kubisch : m3m : Fm3m

III/A.08-015

Frankdicksonite

BaF2

kubisch : m3m : Fm3m

III/A.08-020

Fluorocronite

PbF2

kubisch : m3m : Fm3m

III/A.08-022

Håleniusite-(La)

(La,Ce)OF

kubisch : m3m : Fm3m

III/A.08-025

Tveitite-(Y)

(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

trigonal : 3 : R3

III/A.08-030

Gagarinite-(Y)

NaCaY(F,Cl)6

hexagonal : 6/m : P63/m

III/A.08-040

Gagarinite-(Ce)

NaCaCeF6

trigonal : 3 : P3

III/A.08-045

Polezhaevaite-(Ce)

NaSrCeF6

hexagonal : 6/m : P63/m

III/A.08-047

Laurelite

Pb7F12Cl2

hexagonal : 3m : P6

III/A.08-050

Coccinite

Hg2+I2

tetragonal : 4/mmm : P42/nmc

III/A.08-060

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

Cotunnite

PbCl2

orthorhombisch : mmm : Pnam

3.EB.100

Laurelite

Pb7F12Cl2

hexagonal : 3m : P6

3.EB.120

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Laurelite

Pb7F12Cl2

hexagonal : 3m : P6

09.02.10.01

Matlockite

PbFCl

tetragonal : 4/mmm : P4/nmm

09.02.11.01

Rorisite

(Ca,Mg)FCl

tetragonal : 4/mmm : P4/nmm

09.02.11.02

CNMNC (IMA)-Number

IMA 1988-020a

CNMNC symbol

Symbol

Lrl

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