Mineralogy Database

Latrappite Mineral Data

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General Latrappite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)(Nb,Ti,Fe)O3
Help on Composition: Composition: Molecular Weight = 154.29 gm
   Sodium      2.98 %  Na    4.02 % Na2O
   Calcium    20.78 %  Ca   29.08 % CaO
   Magnesium   1.58 %  Mg    2.61 % MgO
   Titanium    6.21 %  Ti   10.35 % TiO2
   Niobium    30.11 %  Nb   43.07 % Nb2O5
   Iron        7.24 %  Fe    9.31 % FeO
   Oxygen     31.11 %  O
             ______        ______ 
             100.00 %       98.44 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.8Na0.2Nb0.5Ti0.2Fe2+0.2Mg0.1O3
Help on Environment: Environment: Carbonitite rocks. The crystal structure of latrappite, determined by Rietveld analysis, is similar to that of CaTiO3 perovskite.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: St Lawrence Columbium and Metals Corporation mine, near La Trappe, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Latrappite + Pronunciation Say LATRAPPITE
Help on Synonym: Synonym: ICSD 85569
  PDF 16-694

Latrappite Image

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Comments: Black, sub-metallic crystals of latrappite on matrix.
Location: La Trappe Quarry, Oka, Quebec, Canada. Scale: Crystal size 4 X 4 mm.
© John Veevaert

Latrappite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9858:1:1.4038
Help on Cell Dimensions: Cell Dimensions: a = 5.4479, b = 5.5259, c = 7.7575, Z = 4; V = 233.54 Den(Calc)= 4.39
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.744(1), 3.887(0.79), 1.942(0.57),

Physical Properties of Latrappite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.4
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Metallic
Help on Streak: Streak: gray

Optical Properties of Latrappite

Help on Optical Data: Optical Data: NCalc= 2.09 - from Gladstone-Dale relationship (KC = 0.2475) where Ncalc=Dcalc*KC+1
NCalc= 2.09 - from Gladstone-Dale relationship (KC = 0.2475) where Ncalc=Dmeas*KC+1

Calculated Properties of Latrappite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Latrappite =4.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELatrappite = 50.67 barns/electron
U=PELatrappite x rElectron Density= 211.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Latrappite is Not Radioactive

Latrappite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.03)with a cation charge of 3+ (A+++2 O3)
  (04.03.03)Perovskite Group Perovskite CaTiO3 P nma 2/m 2/m 2/m Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m Lueshite NaNbO3 P 2221 2 2 2 Tausonite SrTiO3 P m3m 4/m 3 2/m Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m Barioperovskite! BaTiO3 Amm2 mm2 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.CC.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CC -With large and medium-sized cations
04.CC.30 Natroniobite NaNbO3 Mono
04.CC.30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m
04.CC.30 Lueshite NaNbO3 P 2221 2 2 2
04.CC.30 Perovskite CaTiO3 P nma 2/m 2/m 2/m
04.CC.30 Barioperovskite! BaTiO3 Amm2 mm2
04.CC.30 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m

Other Latrappite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Latrappite :
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: 04.CC.30





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