Laurelite Mineral Data

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.

Name Pronunciation:

Laurelite + Pronunciation

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 Dipyramidal H-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),

Physical Properties of Laurelite

Cleavage:

{0001} Imperfect

Color:

Colorless.

Density:

7.65

Diaphaneity:

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

Optical Data:

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

Calculated Properties of Laurelite

Electron Density:

Bulk Density (Electron Density)=6.54 gm/cc
note: Specific Gravity of Laurelite =7.99 gm/cc.

Fermion Index:

Fermion Index = 0.18
Boson Index = 0.82

Photoelectric:

PE_Laurelite=1,555.20 barns/electron
U=PE_Laurelite x rElectron Density=10172.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laurelite is Not Radioactive

Laurelite Classification

Dana Class:

09.02.10.01 (09)Anhydrous and Hydrated Halides

(09.02)where A (X)2

(09.02.10)Dana Group

09.02.10.01 Laurelite Pb7F12Cl2 P 6 6

Strunz Class:

03.DC.20 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

03.DC -With Pb (As,Sb,Bi), without Cu

03.DC.20 Laurelite Pb7F12Cl2 P 6 6

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Laurelite

Pb7F12Cl2
Dana No: 09.02.10.01 Strunz No: 03.DC.20
Locality:

Notes:

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