Mineralogy Database

Allendeite Mineral Data

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General Allendeite Information

Help on Chemical  Formula: Chemical Formula: Sc4Zr3O12
Help on Composition: Composition: Molecular Weight = 648.47 gm
   Calcium     1.92 %  Ca    2.68 % CaO
   Yttrium     0.55 %  Y     0.70 % Y2O3
   Hafnium     1.10 %  Hf    1.30 % HfO2
   Zirconium  41.50 %  Zr   56.06 % ZrO2
   Scandium   20.87 %  Sc   32.01 % Sc2O3
   Titanium    3.25 %  Ti    5.42 % TiO2
   Aluminum    0.37 %  Al    0.71 % Al2O3
   Vanadium    0.24 %  V     0.35 % V2O3
   Iron        0.60 %  Fe    0.78 % FeO
   Oxygen     29.61 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sc3.01Ti0.44Ca0.31Al0.09Fe2+0.07Y0.04V3+0.03Zr2.95Hf0.04O12
Help on Environment: Environment: The mineral occurs in a partially altered refractory inclusion in section USNM 7554. Probable pre-solar refractory mineral. New structure type.
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: Allende meteorite, Pueblito de Allende, Chihuahua, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2007-027

Allendeite Image

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  Allendeite   Hexamolybdenum

Comments: BSE image of the refractory inclusion in the Allendeite meteorite containing allendeite (BSE bright phase) and hexamolybdenum (BSE bright phase).
Location: Allende meteorite, Pueblito de Allende, Chihuahua, Mexico.. Scale: See Image.
© Lunar and Planetary Science Instutute

Allendeite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.92805
Help on Cell Dimensions: Cell Dimensions: a = 9.396, c = 8.72, Z = 3; V = 666.70 Den(Calc)= 4.85
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.9(1), 4.698(0.5), 1.152(0.4),1.45(0.4), 1.776(0.32), 1.779(0.27), 1.515(0.19), 2.513(0.18),

Physical Properties of Allendeite

Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.

Optical Properties of Allendeite

Help on Optical Data: Optical Data: NCalc= 2.14 - from Gladstone-Dale relationship (KC = 0.234) where Ncalc=Dcalc*KC+1

Calculated Properties of Allendeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.51 gm/cc
note: Specific Gravity of Allendeite =4.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEAllendeite = 73.83 barns/electron
U=PEAllendeite x rElectron Density= 332.65 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Allendeite is Not Radioactive

Allendeite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.11)as titano-oxides with [4] and [6] substitutions
  (07.11.11)Dana Group Mongshanite* (Mg,Cr,Fe)2(Ti,Zr)5O12 Unk Hex Allendeite! Sc4Zr3O12 R 3 3
Help on  Strunz Class: Strunz Class: 04.XX.00 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.X - Unclassified Strunz OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, telluri
  04.XX -Unknown
04.XX.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m
04.XX.00 Methane hydrate-I! 46(H2O)•2(S)•6(L) P m3n 4/m 3 2/m
04.XX.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono
04.XX.00 Chubutite* Pb7O6Cl2 Unk Ortho
04.XX.00 Kleberite* FeTi6O13•4(H2O)(?) P 63mcm ? 6mm
04.XX.00 Hongquiite* TiO F m3m 4/m 3 2/m
04.XX.00 Psilomelane? (Ba,H2O)2Mn5O10 A2/m 2/m
04.XX.00 Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m
04.XX.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 63/m,P 63 Hex
04.XX.00 Uhligite? Ca3(Ti,Al,Zr)9O20 Unk Cubic
04.XX.00 Scheteligite? (Ca,Y,Sb,Mn)2(Ti,Ta,Nb,W)2O6(O,OH) Unk Ortho
04.XX.00 Allendeite! Sc4Zr3O12 R 3 3
04.XX.00 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m
04.XX.00 Methane hydrate-II! 136(H2O)•16(S)•8(L) F d3m 4/m 3 2/m
04.XX.00 IMA2000-026! (Mn,Li)4(Ta,Sn)4(Ta,Nb)8O32 C 2/c 2/m
04.XX.00 Methane hydrate-H! 34(H2O)•3(S)•2(M)•1(L) P 6/mmm 6/m 2/m 2/m

Other Allendeite Information

Help on References: References: NAME( Lunar and Planetary Science Conference March 2000) PHYS. PROP.(Lunar and Planetary Science Conference March 2000)
Help on See Also: See Also: Links to other databases for Allendeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 04.XX.00





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