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Allendeite Mineral Data
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General Allendeite Information
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 Chemical Formula: |
Sc4Zr3O12 |
| Composition: |
Molecular Weight = 648.47 gm |
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Calcium 1.92 % Ca 2.68 % CaO |
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Yttrium 0.55 % Y 0.70 % Y2O3 |
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Hafnium 1.10 % Hf 1.30 % HfO2 |
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Zirconium 41.50 % Zr 56.06 % ZrO2 |
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Scandium 20.87 % Sc 32.01 % Sc2O3 |
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Titanium 3.25 % Ti 5.42 % TiO2 |
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Aluminum 0.37 % Al 0.71 % Al2O3 |
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Vanadium 0.24 % V 0.35 % V2O3 |
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Iron 0.60 % Fe 0.78 % FeO |
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Oxygen 29.61 % O |
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______ ______ |
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100.00 % 99.99 % = TOTAL OXIDE |
| Empirical Formula: |
Sc3.01Ti0.44Ca0.31Al0.09Fe2+0.07Y0.04V3+0.03Zr2.95Hf0.04O12 |
| 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 |
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Allendeite Image |
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Images:
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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 |
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Allendeite Crystallography
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| 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 - Rhombohedral H-M Symbol ( 3) Space Group: R 3 |
| 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), |
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Physical Properties of Allendeite
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| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
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Optical Properties of Allendeite
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| Optical Data: |
NCalc= 2.14 - from Gladstone-Dale relationship (KC = 0.234) where Ncalc=Dcalc*KC+1
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Calculated Properties of Allendeite
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| Electron Density: |
Bulk Density (Electron Density)=4.51 gm/cc
note: Specific Gravity of Allendeite =4.85 gm/cc.
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| Fermion Index: |
Fermion Index = 0.05
Boson Index = 0.95 |
| Photoelectric: |
PEAllendeite = 73.83 barns/electron
U=PEAllendeite x rElectron Density= 332.65 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Allendeite is Not Radioactive |
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Allendeite Classification
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| Dana Class: |
07.11.11.02 (07)Multiple Oxides |
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(07.11)as titano-oxides with [4] and [6] substitutions |
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(07.11.11)Dana Group |
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07.11.11.01 Mongshanite* (Mg,Cr,Fe)2(Ti,Zr)5O12 Unk Hex |
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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 |
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04.X - Unclassified Strunz OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, telluri |
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04.XX -Unknown |
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04.XX.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m |
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04.XX.00 Methane hydrate-I! 46(H2O)•2(S)•6(L) P m3n 4/m 3 2/m |
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04.XX.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono |
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04.XX.00 Chubutite* Pb7O6Cl2 Unk Ortho |
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04.XX.00 Kleberite* FeTi6O13•4(H2O)(?) P 63mcm ? 6mm |
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04.XX.00 Hongquiite* TiO F m3m 4/m 3 2/m |
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04.XX.00 Psilomelane? (Ba,H2O)2Mn5O10 A2/m 2/m |
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04.XX.00 Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m |
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04.XX.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 63/m,P 63 Hex |
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04.XX.00 Uhligite? Ca3(Ti,Al,Zr)9O20 Unk Cubic |
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04.XX.00 Scheteligite? (Ca,Y,Sb,Mn)2(Ti,Ta,Nb,W)2O6(O,OH) Unk Ortho |
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04.XX.00 Allendeite! Sc4Zr3O12 R 3 3 |
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04.XX.00 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m |
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04.XX.00 Methane hydrate-II! 136(H2O)•16(S)•8(L) F d3m 4/m 3 2/m |
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04.XX.00 IMA2000-026! (Mn,Li)4(Ta,Sn)4(Ta,Nb)8O32 C 2/c 2/m |
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04.XX.00 Methane hydrate-H! 34(H2O)•3(S)•2(M)•1(L) P 6/mmm 6/m 2/m 2/m |
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Other Allendeite Information
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| 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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Allendeite
Sc4Zr3O12
Dana No: 07.11.11.02 Strunz No: 04.XX.00
Locality:
Notes:
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