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Lawrencite Mineral Data

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General Lawrencite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Ni)Cl2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+0.75Ni0.25Cl2
Help on Environment: Environment: Terrestrial alteration of meteoritic iron.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1877
Help on Locality: Locality: Tazewell, Ovifak, Canyon Diablo, and other iron meteorites. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Lawrence Smith (1818-1883), American chemist, mineralogist, and student of meteorites, who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Lawrencite + Pronunciation Say LAWRENCITE
Help on Synonym: Synonym: ICSD 4059
  PDF 1-1106

Lawrencite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:4.89727
Help on Cell Dimensions: Cell Dimensions: a = 3.5775, c = 17.52, Z = 3; V = 194.19 Den(Calc)= 3.27
Help on Crystal System: 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/Io): 2.54(1), 1.8(0.63), 5.9(0.63),

Physical Properties of Lawrencite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Greenish brown, White.
Help on Density: Density: 3.162
Help on Diaphaneity: Diaphaneity: Transparent

Optical Properties of Lawrencite

Help on Optical Data: Optical Data: Uniaxial (-), e=1.576, w=1.576, bire=0.0000.

Calculated Properties of Lawrencite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Lawrencite =3.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0082672251
Boson Index = 0.9917327749
Help on Photoelectric: Photoelectric: PELawrencite = 18.47 barns/electron
U=PELawrencite x rElectron Density= 57.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lawrencite is Not Radioactive

Lawrencite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.02)where A (X)2
  (09.02.03)Dana Group Lawrencite (Fe,Ni)Cl2 R 3m 3 2/m Scacchite MnCl2 R 3m 3 2/m Chloromagnesite* MgCl2 R 3m 3 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 03.AB.20





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