Allendeite Mineral Data

General Allendeite Information

Chemical Formula:

Sc4Zr3O12

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

Empirical Formula:

Sc_3.01Ti_0.44Ca_0.31Al_0.09Fe²⁺_0.07Y_0.04V³⁺_0.03Zr_2.95Hf_0.04O₁₂

Environment:

The mineral occurs in a partially altered refractory inclusion in section USNM 7554. Probable pre-solar refractory mineral. New structure type.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Allende meteorite, Pueblito de Allende, Chihuahua, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2007-027

Allendeite Image

Images:

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

Axial Ratios:

a:c = 1:0.92805

Cell Dimensions:

a = 9.396, c = 8.72, Z = 3; V = 666.70 Den(Calc)= 4.85

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 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

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Optical Properties of Allendeite

Optical Data:

NCalc= 2.14 - from Gladstone-Dale relationship (KC = 0.234) where Ncalc=Dcalc*KC+1

Calculated Properties of Allendeite

Electron Density:

Bulk Density (Electron Density)=4.51 gm/cc
note: Specific Gravity of Allendeite =4.85 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Allendeite= 73.83 barns/electron
U=PE_Allendeite x rElectron Density= 332.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Allendeite is Not Radioactive

Allendeite Classification

Dana Class:

07.11.11.02 (07)Multiple Oxides

(07.11)as titano-oxides with [4] and [6] substitutions

(07.11.11)Dana Group

07.11.11.01 Mongshanite* (Mg,Cr,Fe)2(Ti,Zr)5O12 Unk Hex

07.11.11.02 Allendeite! Sc4Zr3O12 R 3 3

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

References:

NAME( Lunar and Planetary Science Conference March 2000) PHYS. PROP.(Lunar and Planetary Science Conference March 2000)

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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Ask about Allendeite here :
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Print or Cut-and-Paste your Allendeite Specimen Label here :

Allendeite

Sc4Zr3O12
Dana No: 07.11.11.02 Strunz No: 04.XX.00
Locality:

Notes: