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Melilite (Gehlenite - Åkermanite)

Melilite basanite
Owen, Urach, Germany
Source: Thin section collection Institut für Mineralogie und Mineralische Rohstoffe, TU Clausthal
Photos: MMR
Comments and references:
  
  PPL

Variable crystal orientations
 
 
  +Pol

Variable crystal orientations, mostly diagonal position (max Δn)
Variable crystal orientations, mostly diagonal position, +1λ
 

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Width of view   Pol orientation
 
 0.5 mm
   
 W-E
     

Melilite (Gehlenite - Åkermanite)
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