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Lewisite Mineral Data
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General Lewisite Information
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 Chemical Formula: |
(Ca,Fe++,Na)2(Sb,Ti)2O7 |
| Composition: |
Molecular Weight = 426.94 gm |
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Sodium 0.81 % Na 1.09 % Na2O |
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Calcium 12.20 % Ca 17.08 % CaO |
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Titanium 2.24 % Ti 3.74 % TiO2 |
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Manganese 0.64 % Mn 0.83 % MnO |
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Iron 6.54 % Fe 8.41 % FeO |
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Antimony 51.33 % Sb 68.19 % Sb2O5 |
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Oxygen 26.23 % O |
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______ ______ |
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100.00 % 99.34 % = TOTAL OXIDE |
| Empirical Formula: |
Ca1.3Fe2+0.5Na0.15Mn2+0.05Sb1.8Ti0.2O7 |
| Environment: |
An alteration of large tetrahedrite crystals and in eluvial sands. Lewisite (1899) is now considered Ti-bearing romeite. |
| IMA Status: |
Discredited IMA 2006 (Dana # Added) |
| Locality: |
Tripuhy cinnabar mine, Ouro Preto, Minas Gerais, Barzil. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Willam James Lewis (1847-1926), Professor of Mineralogy, Cambridge University, Canbridge, England. |
| Name Pronunciation: |
Lewisite  |
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Lewisite Crystallography
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| Cell Dimensions: |
a = 10.64, Z = 8; V = 1,204.55 Den(Calc)= 4.71 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m |
| 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), |
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Physical Properties of Lewisite
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| Cleavage: |
{111} Imperfect, {111} Imperfect, {111} Imperfect |
| Color: |
Honey yellow, Amber yellow, Yellowish brown. |
| Density: |
4.95 |
| Diaphaneity: |
Transparent to Subopaque |
| Fracture: |
Hackly - Jagged, torn surfaces, (e.g. fractured metals). |
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
| Habit: |
Pulverulent - Forms a loose, poorly-coherent powdery mass. |
| Hardness: |
5.5 - Knife Blade |
| Luster: |
Vitreous - Resinous |
| Streak: |
light yellowish brown |
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Optical Properties of Lewisite
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| Optical Data: |
Isotropic. |
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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
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Calculated Properties of Lewisite
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| Electron Density: |
Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Lewisite =4.71 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0045773186
Boson Index = 0.9954226814 |
| Photoelectric: |
PELewisite = 170.36 barns/electron
U=PELewisite x rElectron Density= 729.57 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lewisite is Not Radioactive |
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Lewisite Classification
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| Dana Class: |
44.01.01.03a (44)Antimonates |
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(44.01)(A)2 (X2 O6) (O,OH,F) |
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(44.01.01)Stibiconite Group |
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44.01.01.01 Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m |
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44.01.01.02 Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m |
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44.01.01.03 Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m |
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44.01.01.03a Lewisite? (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m |
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44.01.01.04 Monimolite (Pb,Ca)2Sb2O7 F d3m 4/m 3 2/m |
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44.01.01.05 Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m |
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44.01.01.06 Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m |
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44.01.01.07 Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m |
| Strunz Class: |
08.XX.00 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.X - Unclassified Strunz PHOSPHATES, ARSENATES, VANADATES |
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08.XX -Stibiconite Group |
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08.XX.00 Arsenobismite? Bi2(AsO4)(OH)3 Unk Ortho |
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08.XX.00 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8•4-5(H2O) P1 1 |
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08.XX.00 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m |
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08.XX.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m |
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08.XX.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m |
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08.XX.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho |
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08.XX.00 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m |
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08.XX.00 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho |
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08.XX.00 Viseite Ca10Al24(SiO4)6(PO4)7O22F3•72(H2O)(?) I a3d 4/m 3 2/m |
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08.XX.00 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8•4(H2O)(?) C 2/c ? 2/m |
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08.XX.00 Sodium-autunite Na2(UO2)2(PO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m |
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08.XX.00 Sodium meta-autunite! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m |
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08.XX.00 Slavkovite! Cu13(AsO4)6(AsO3OH)4•23(H2O) P1 1 |
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08.XX.00 IMA2000-020! Fe4[AsO3OH]5[AsO2(OH)2]2•20(H2O) Ortho Ortho |
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08.XX.00 Lewisite! (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m |
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08.XX.00 Kamarizaite! Fe3(AsO4)2(OH)3•3H2O Pccm, Pcc2, Pcmm, Pcm21 Ortho |
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08.XX.00 Lapeyreite! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m |
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08.XX.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m |
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08.XX.00 IMA2009-002! Cu3(AsO4)2 P 21/c 2/m |
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08.XX.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m |
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08.XX.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1 |
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Other Lewisite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3) |
| 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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Lewisite
(Ca,Fe++,Na)2(Sb,Ti)2O7
Dana No: 44.01.01.03a Strunz No: 08.XX.00
Locality:
Notes:
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