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Spinel

Corundum-spinel-anorthite-phlogopite rock (sakenite)
Sakeny, southern Madagascar
Source: Thin section collection M.M. Raith
Photos: MMR
Comments and references:
Reaction corona: corundum → spinel
 
  PPL

Non-specific crystal orientations
 
 
  +Pol

Non-specific crystal orientations
 

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Mg-spinel
 

Width of view   Pol orientation
 
 4 mm
   
 W-E
     

Spinel
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