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Lewisite Mineral Data

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General Lewisite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Fe++,Na)2(Sb,Ti)2O7
Help on Composition: Composition: Molecular Weight = 426.94 gm
   Sodium      0.81 %  Na    1.09 % Na2O
   Calcium    12.20 %  Ca   17.08 % CaO
   Titanium    2.24 %  Ti    3.74 % TiO2
   Manganese   0.64 %  Mn    0.83 % MnO
   Iron        6.54 %  Fe    8.41 % FeO
   Antimony   51.33 %  Sb   68.19 % Sb2O5
   Oxygen     26.23 %  O
             ______        ______ 
             100.00 %       99.34 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.3Fe2+0.5Na0.15Mn2+0.05Sb1.8Ti0.2O7
Help on Environment: Environment: An alteration of large tetrahedrite crystals and in eluvial sands. Lewisite (1899) is now considered Ti-bearing romeite.
Help on IMA Status: IMA Status: Discredited IMA 2006 (Dana # Added)
Help on Locality: Locality: Tripuhy cinnabar mine, Ouro Preto, Minas Gerais, Barzil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Willam James Lewis (1847-1926), Professor of Mineralogy, Cambridge University, Canbridge, England.
Help on Name Pronunciation: Name Pronunciation: Lewisite Say LEWISITE

Lewisite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.64, Z = 8; V = 1,204.55 Den(Calc)= 4.71
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.548(1), 1.813(1), 2.94(1),0.989(0.5), 1.05(0.5), 1.15(0.5), 1.179(0.5),

Physical Properties of Lewisite

Help on Cleavage: Cleavage: {111} Imperfect, {111} Imperfect, {111} Imperfect
Help on Color: Color: Honey yellow, Amber yellow, Yellowish brown.
Help on Density: Density: 4.95
Help on Diaphaneity: Diaphaneity: Transparent to Subopaque
Help on Fracture: Fracture: Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: light yellowish brown

Optical Properties of Lewisite

Help on Optical Data: Optical Data: Isotropic.
  NCalc= 1.82 - from Gladstone-Dale relationship (KC = 0.1744) where Ncalc=Dcalc*KC+1
NCalc= 1.86 - from Gladstone-Dale relationship (KC = 0.1744) where Ncalc=Dmeas*KC+1

Calculated Properties of Lewisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Lewisite =4.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0045773186
Boson Index = 0.9954226814
Help on Photoelectric: Photoelectric: PELewisite = 170.36 barns/electron
U=PELewisite x rElectron Density= 729.57 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lewisite is Not Radioactive

Lewisite Classification

Help on  Dana Class: Dana Class: (44)Antimonates
  (44.01)(A)2 (X2 O6) (O,OH,F)
  (44.01.01)Stibiconite Group Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m Lewisite? (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m Monimolite (Pb,Ca)2Sb2O7 F d3m 4/m 3 2/m Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 08.XX.00 08 - PHOSPHATES, ARSENATES, VANADATES
  08.XX -Stibiconite Group
08.XX.00 Arsenobismite? Bi2(AsO4)(OH)3 Unk Ortho
08.XX.00 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8•4-5(H2O) P1 1
08.XX.00 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m
08.XX.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m
08.XX.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m
08.XX.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho
08.XX.00 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m
08.XX.00 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho
08.XX.00 Viseite Ca10Al24(SiO4)6(PO4)7O22F3•72(H2O)(?) I a3d 4/m 3 2/m
08.XX.00 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8•4(H2O)(?) C 2/c ? 2/m
08.XX.00 Sodium-autunite Na2(UO2)2(PO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m
08.XX.00 Sodium meta-autunite! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m
08.XX.00 Slavkovite! Cu13(AsO4)6(AsO3OH)4•23(H2O) P1 1
08.XX.00 IMA2000-020! Fe4[AsO3OH]5[AsO2(OH)2]2•20(H2O) Ortho Ortho
08.XX.00 Lewisite! (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m
08.XX.00 Kamarizaite! Fe3(AsO4)2(OH)3•3H2O Pccm, Pcc2, Pcmm, Pcm21 Ortho
08.XX.00 Lapeyreite! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m
08.XX.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m
08.XX.00 IMA2009-002! Cu3(AsO4)2 P 21/c 2/m
08.XX.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m
08.XX.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1

Other Lewisite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Lewisite :
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: 08.XX.00





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