Latrappite Mineral Data

Latrappite Mineral Data +

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General Latrappite Information

Chemical Formula:

(Ca,Na)(Nb,Ti,Fe)O3

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

Empirical Formula:

Ca_0.8Na_0.2Nb_0.5Ti_0.2Fe²⁺_0.2Mg_0.1O₃

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.

Synonym:

ICSD 85569

IMA1964-019

PDF 16-694

Latrappite Image

Images:

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

Latrappite Crystallography

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcmn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.744(1), 3.887(0.79), 1.942(0.57),

Crystal Structure:

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Mitchell R H , Choi J B , Hawthorne F C , McCammon C A , Burns P C , The Canadian Mineralogist , 36 (1998) p.107-116, Latrappite: A re-investigation

Physical Properties of Latrappite

Cleavage:

None

Color:

Black.

Density:

4.4

Diaphaniety:

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

Optical Properties of Latrappite

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

Electron Density:

r_electron=4.18 gm/cc
note: r_Latrappite=4.39 gm/cc.

Fermion Index

Fermion Index = 0.01156
Boson Index = 0.98844

Photoelectric:

PE_Latrappite= 50.67 barns/electron
U=PE_Latrappite x r_electron= 211.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Latrappite is Not Radioactive

Latrappite Classification

Dana Class:

4.3.3.2 (4)Simple Oxides

(4.3)with a cation charge of 3+ (A+++2 O3)

(4.3.3)Dana Group

4.3.3.1 Perovskite CaTiO3 P nma 2/m 2/m 2/m

4.3.3.2 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

4.3.3.3 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

4.3.3.4 Lueshite NaNbO3 P 222₁ 2 2 2

4.3.3.5 Tausonite SrTiO3 P m3m 4/m 3 2/m

4.3.3.6 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

Strunz Class:

IV/C.10-30 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.10 - Perowskite series

IV/C.10-10 Uhligite Ca3(Ti,Al,Zr)9O20 Unk Cubic

IV/C.10-20 Perovskite CaTiO3 P nma 2/m 2/m 2/m

IV/C.10-30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

IV/C.10-40 Tausonite SrTiO3 P m3m 4/m 3 2/m

IV/C.10-50 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

IV/C.10-55 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

IV/C.10-60 Lueshite NaNbO3 P 222₁ 2 2 2

IV/C.10-70 Natroniobite NaNbO3 Mono

IV/C.10-80 Macedonite PbTiO3 P 4/mmm 4/m 2/m 2/m

Other Latrappite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Latrappite

(Ca,Na)(Nb,Ti,Fe)O3
Dana No: 4.3.3.2 Strunz No: IV/C.10-30
Locality:

Notes: