Lawrencite Mineral Data

Lawrencite Mineral Data +

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General Lawrencite Information

Chemical Formula:

(Fe++,Ni)Cl2

Composition:

Molecular Weight = 127.46 gm

Iron 32.86 % Fe 42.27 % FeO

Nickel 11.51 % Ni 14.65 % NiO

Chlorine 55.63 % Cl 55.63 % Cl

- % Cl -12.55 % -O=Cl₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.75Ni_0.25Cl₂

Environment:

Occurs in meteoric iron.

IMA Status:

Valid Species (Pre-IMA) 1877

Locality:

Iron - nickel meteorites Link to MinDat.org Location Data.

Synonym:

ICSD 4059

PDF 1-1106

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Lawrencite Crystallography

Axial Ratios:

a:c = 1:4.89727

Cell Dimensions:

a = 3.5775, c = 17.52, Z = 3; V = 194.19 Den(Calc)= 3.27

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.54(1), 1.8(0.63), 5.9(0.63),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: cadmium chloride structure

Physical Properties of Lawrencite

Cleavage:

[0001] Perfect

Color:

Greenish brown, White.

Density:

3.162

Diaphaniety:

Transparent

Optical Properties of Lawrencite

Gladstone-Dale:

CI meas= 0.352 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.373 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1761,KPDmeas= 0.1822,KC= 0.281

Optical Data:

Uniaxial (-), e=1.576, w=1.576, bire=0.0000.

Calculated Properties of Lawrencite

Electron Density:

r_electron=3.00 gm/cc
note: r_Lawrencite=3.16 gm/cc.

Fermion Index

Fermion Index = 0.00826
Boson Index = 0.99174

Photoelectric:

PE_Lawrencite= 18.47 barns/electron
U=PE_Lawrencite x r_electron= 55.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lawrencite is Not Radioactive

Lawrencite Classification

Dana Class:

9.2.3.1 (9)Anhydrous and Hydrated Halides

(9.2)where A (X)2

(9.2.3)Dana Group

9.2.3.1 Lawrencite (Fe,Ni)Cl2 R 3m 3 2/m

9.2.3.2 Scacchite MnCl2 R 3m 3 2/m

9.2.3.3 Chloromagnesite* MgCl2 R 3m 3 2/m

Strunz Class:

III/A.07-10 III - Halogenides

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

III/A.07 - Tolbachite series

III/A.07-05 Chloromagnesite* MgCl2 R 3m 3 2/m

III/A.07-10 Lawrencite (Fe,Ni)Cl2 R 3m 3 2/m

III/A.07-20 Scacchite MnCl2 R 3m 3 2/m

III/A.07-30 Tolbachite CuCl2 C 2/m 2/m

Other Lawrencite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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

Lawrencite

(Fe++,Ni)Cl2
Dana No: 9.2.3.1 Strunz No: III/A.07-10
Locality:

Notes: