Lawrencite Mineral Data

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:

Terrestrial alteration of meteoritic iron.

IMA Status:

Valid Species (Pre-IMA) 1877

Locality:

Tazewell, Ovifak, Canyon Diablo, and other iron meteorites. Link to MinDat.org Location Data.

Name Origin:

Named for John Lawrence Smith (1818-1883), American chemist, mineralogist, and student of meteorites, who discovered the mineral.

Name Pronunciation:

Lawrencite + Pronunciation

Synonym:

ICSD 4059

PDF 1-1106

Lawrencite Image

Images:

Lawrencite

Comments: Capillary tube of lawrencite solution with opaque oxidized precipitates, derived from hydroscopically absorbing water from the air by solid lawrencite, collected from an oozing meteorite.
Location: Nantan meteorites (Nandan meteorites), Lihu - Yaochai area, Nandan Co., Hechi Prefecture, Guangxi Zhuang Autonomous Region, China. Scale: Tube Width 0.25 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

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 Scalenohedral H-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),

Physical Properties of Lawrencite

Cleavage:

{0001} Perfect

Color:

Greenish brown, White.

Density:

3.162

Diaphaneity:

Transparent

Optical Properties of Lawrencite

Optical Data:

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

Calculated Properties of Lawrencite

Electron Density:

Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Lawrencite =3.27 gm/cc.

Fermion Index:

Fermion Index = 0.0082672251
Boson Index = 0.9917327749

Photoelectric:

PE_Lawrencite= 18.47 barns/electron
U=PE_Lawrencite x rElectron Density= 57.33 barns/cc.

Radioactivity:

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

Lawrencite Classification

Dana Class:

09.02.03.01 (09)Anhydrous and Hydrated Halides

(09.02)where A (X)2

(09.02.03)Dana Group

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

09.02.03.02 Scacchite MnCl2 R 3m 3 2/m

09.02.03.03 Chloromagnesite* MgCl2 R 3m 3 2/m

Strunz Class:

03.AB.20 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AB -M:X = 1:2

03.AB.20 Chloromagnesite* MgCl2 R 3m 3 2/m

03.AB.20 Lawrencite (Fe,Ni)Cl2 R 3m 3 2/m

03.AB.20 Scacchite MnCl2 R 3m 3 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 - 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 Lawrencite Specimen Label here :

Lawrencite

(Fe++,Ni)Cl2
Dana No: 09.02.03.01 Strunz No: 03.AB.20
Locality:

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