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Latrappite Mineral Data
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General Latrappite Information
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 Chemical Formula: |
(Ca,Na)(Nb,Ti,Fe)O3 |
| Composition: |
Molecular Weight = 154.29 gm |
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Sodium 2.98 % Na 4.02 % Na2O |
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Calcium 20.78 % Ca 29.08 % CaO |
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Magnesium 1.58 % Mg 2.61 % MgO |
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Titanium 6.21 % Ti 10.35 % TiO2 |
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Niobium 30.11 % Nb 43.07 % Nb2O5 |
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Iron 7.24 % Fe 9.31 % FeO |
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Oxygen 31.11 % O |
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______ ______ |
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100.00 % 98.44 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.8Na0.2Nb0.5Ti0.2Fe2+0.2Mg0.1O3 |
| Environment: |
Carbonitite rocks. The crystal structure of latrappite, determined by Rietveld analysis, is similar to that of CaTiO3 perovskite. |
| IMA Status: |
Approved IMA 1964 |
| Locality: |
St Lawrence Columbium and Metals Corporation mine, near La Trappe, Quebec, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Latrappite + Pronunciation  |
| Synonym: |
ICSD 85569 |
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IMA1964-019 |
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PDF 16-694 |
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Latrappite Image |
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Images:
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Latrappite
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 |
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Latrappite Crystallography
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| Axial Ratios: |
a:b:c =0.9858:1:1.4038 |
| Cell Dimensions: |
a = 5.4479, b = 5.5259, c = 7.7575, Z = 4; V = 233.54 Den(Calc)= 4.39 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcmn |
| X Ray Diffraction: |
By Intensity(I/Io): 2.744(1), 3.887(0.79), 1.942(0.57), |
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Physical Properties of Latrappite
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| Cleavage: |
None |
| Color: |
Black. |
| Density: |
4.4 |
| Diaphaneity: |
Opaque |
| Habit: |
Pseudo Cubic - Crystals show a cubic outline. |
| Habit: |
Twinning Common - Crystals are usually twinned. |
| Hardness: |
5.5 - Knife Blade |
| Luster: |
Metallic |
| Streak: |
gray |
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Optical Properties of Latrappite
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| 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
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Calculated Properties of Latrappite
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| Electron Density: |
Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Latrappite =4.39 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PELatrappite = 50.67 barns/electron
U=PELatrappite x rElectron Density= 211.93 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Latrappite is Not Radioactive |
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Latrappite Classification
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| Dana Class: |
04.03.03.02 (04)Simple Oxides |
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(04.03)with a cation charge of 3+ (A+++2 O3) |
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(04.03.03)Perovskite Group |
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04.03.03.01 Perovskite CaTiO3 P nma 2/m 2/m 2/m |
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04.03.03.02 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m |
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04.03.03.03 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m |
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04.03.03.04 Lueshite NaNbO3 P 2221 2 2 2 |
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04.03.03.05 Tausonite SrTiO3 P m3m 4/m 3 2/m |
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04.03.03.06 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m |
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04.03.03.07 Barioperovskite! BaTiO3 Amm2 mm2 |
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04.03.03.08 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m |
| Strunz Class: |
04.CC.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.C - Metal:Oxygen = 2:3, 3:5, and Similar |
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04.CC -With large and medium-sized cations |
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04.CC.30 Natroniobite NaNbO3 Mono |
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04.CC.30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m |
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04.CC.30 Lueshite NaNbO3 P 2221 2 2 2 |
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04.CC.30 Perovskite CaTiO3 P nma 2/m 2/m 2/m |
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04.CC.30 Barioperovskite! BaTiO3 Amm2 mm2 |
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04.CC.30 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m |
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Other Latrappite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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
15 - WWW-MINCRYST
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Latrappite
(Ca,Na)(Nb,Ti,Fe)O3
Dana No: 04.03.03.02 Strunz No: 04.CC.30
Locality:
Notes:
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