Laurelite Mineral Data

Laurelite Mineral Data +

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General Laurelite Information

Chemical Formula:

Pb7F12Cl2

Composition:

Molecular Weight = 1,749.29 gm

Lead 82.91 % Pb 89.32 % PbO

Chlorine 4.05 % Cl 4.05 % Cl

- % Cl -0.91 % -O=Cl₂

Fluorine 13.03 % F 13.03 % F

- % F -5.49 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₇F₁₂Cl₂

Environment:

In a vug isolated from acidic sulfate-rich solutions in the oxidized zone of a low-temperature Pb-Cu-Ag deposit.

IMA Status:

Approved IMA 1989

Locality:

Grand Reef, Mine, Aravaipa District, Laural Canyon, Graham County, Arizona USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 82415

PDF 45-1457

Laurelite Image

Images:

Laurelite

Comments: Snow white acicular crystals of laurelite.
Location: Grand Reef mine, Graham Co., Arizona, United States. Scale: Crystal size 7 mm.
© Tom Loomis / Dakota Matrix

Laurelite Crystallography

Axial Ratios:

a:c = 1:0.38807

Cell Dimensions:

a = 10.267, c = 3.9844, Z = 1; V = 363.73 Den(Calc)= 7.99

Crystal System:

Hexagonal - Trigonal DipyramidalH-M Symbol (6) Space Group: P 6

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.33(1), 1.934(0.6), 1.282(0.4),1.709(0.4), 2.949(0.4), 3.125(0.4), 2.09(0.35),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Merlino S , Pasero M , Perchiazzi N , Kampf A R , American Mineralogist , 81 (1996) p.1277-1281, Laurelite: Its crystal structure and relationship to alpha-PbF2

Physical Properties of Laurelite

Cleavage:

[0001] Imperfect

Color:

Colorless.

Density:

7.65

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2 - Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Laurelite

Gladstone-Dale:

CI meas= 0.123 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.16 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1157,KPDmeas= 0.1208,KC= 0.1377

Optical Data:

Uniaxial (+), w=1.903, e=1.946, bire=0.0430.

Calculated Properties of Laurelite

Electron Density:

r_electron=6.26 gm/cc
note: r_Laurelite=7.65 gm/cc.

Fermion Index

Fermion Index = 0.18323
Boson Index = 0.81677

Photoelectric:

PE_Laurelite=1,555.20 barns/electron
U=PE_Laurelite x r_electron=9,739.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laurelite is Not Radioactive

Laurelite Classification

Dana Class:

9.2.10.1 (9)Anhydrous and Hydrated Halides

(9.2)where A (X)2

(9.2.10)Dana Group

9.2.10.1 Laurelite Pb7F12Cl2 P 6 6

Strunz Class:

III/A.08-50 III - Halogenides

III/A - Simple Halogenides, without water Metal : Halogen = 1 : 2, 1 : 3

III/A.08 - Fluorite series and related compounds

III/A.08-10 Fluorite CaF2 F m3m 4/m 3 2/m

III/A.08-20 Frankdicksonite BaF2 F m3m 4/m 3 2/m

III/A.08-25 Haleniusite-(La)! (La,Ce)OF F m3m 4/m 3 2/m

III/A.08-30 Tveitite-(Y) Ca1-xYxF2x,x~0.3 Unk Mono

III/A.08-40 Gagarinite-(Y) NaCaY(F,Cl)6 P 3 3

III/A.08-45 Zajacite-(Ce) Na(REExCa1-x)(REEyCa1-y)F6where(xney) P 3 3

III/A.08-50 Laurelite Pb7F12Cl2 P 6 6

III/A.08-60 Coccinite* HgI2(?) P 4₁/nmc 4/m 2/m 2/m

Other Laurelite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Laurelite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Laurelite Specimen Label here :

Laurelite

Pb7F12Cl2
Dana No: 9.2.10.1 Strunz No: III/A.08-50
Locality:

Notes: