Mineral Information and Data:

Allendeite
Sc4Zr3O12 [CNMNC approved formula]

Named for the locality : Allende meteorite, Pueblito de Allende, Chihuahua, Mexico.

IMA status : Approved Species 2007 (IMA2007-027)
CLASSIFICATION 
Dana
(8th edition) :
07.11.11.02  
  (07) Multiple Oxides
  (07.11) as titano-oxides with [4] and [6] substitutions
  (07.11.11)
  
Nickel-Strunz
(10th edition) :
04.XX.00
  (04) Oxides and Hydroxides
  (04.X)
  (04.XX) No group assigned
  
Crystal system: Trigonal System
Point group (H-M): 3 — rhombohedral
Unit cell: a = 9.396, c = 8.72
Crystal Habit: Inclusions - Generally found as inclusions in other minerals. Microscopic Crystals - Crystals visible only with microscopes.
  
  
Geologic Setting: The mineral occurs in a partially altered refractory inclusion in section USNM 7554. Probable pre-solar refractory mineral. New structure type.
  

 

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

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