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Lawrencite Mineral Data
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General Lawrencite Information
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Chemical Formula: |
(Fe++,Ni)Cl2 |
Composition: |
Molecular Weight = 127.46 gm |
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Iron 32.86 % Fe 42.27 % FeO |
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Nickel 11.51 % Ni 14.65 % NiO |
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Chlorine 55.63 % Cl 55.63 % Cl |
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- % Cl -12.55 % -O=Cl2
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Fe2+0.75Ni0.25Cl2 |
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 |
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PDF 1-1106 |
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Lawrencite Image |
Images:
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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 |
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Lawrencite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 2.54(1), 1.8(0.63), 5.9(0.63), |
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Physical Properties of Lawrencite
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Cleavage: |
{0001} Perfect |
Color: |
Greenish brown, White. |
Density: |
3.162 |
Diaphaneity: |
Transparent |
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Optical Properties of Lawrencite
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Optical Data: |
Uniaxial (-), e=1.576, w=1.576, bire=0.0000. |
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Calculated Properties of Lawrencite
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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: |
PELawrencite = 18.47 barns/electron U=PELawrencite x rElectron Density= 57.33 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Lawrencite is Not Radioactive |
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Lawrencite Classification
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Dana Class: |
09.02.03.01 (09)Anhydrous and Hydrated Halides |
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(09.02)where A (X)2 |
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(09.02.03)Dana Group |
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09.02.03.01 Lawrencite (Fe,Ni)Cl2 R 3m 3 2/m |
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09.02.03.02 Scacchite MnCl2 R 3m 3 2/m |
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09.02.03.03 Chloromagnesite* MgCl2 R 3m 3 2/m |
Strunz Class: |
03.AB.20 03 - HALIDES |
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03.A - Simple Halides, Without H2O |
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03.AB -M:X = 1:2 |
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03.AB.20 Chloromagnesite* MgCl2 R 3m 3 2/m |
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03.AB.20 Lawrencite (Fe,Ni)Cl2 R 3m 3 2/m |
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03.AB.20 Scacchite MnCl2 R 3m 3 2/m |
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Other Lawrencite Information
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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:
Notes:
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