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Cancrinite - Vishnevite

Cancrinite-nepheline syenite
Särna, Dalarna, Sweden
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
  
  PPL

Variable crystal orientations, mostly sections sub-∥ c
 
 
  +Pol

Variable crystal orientations, mostly sections sub-∥ c; crystal in centre: section ∥ c, diagonal position (max Δn)
Variable crystal orientations, mostly sections sub-∥ c; crystal in centre: section ∥ c, diagonal position, +1λ
 

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Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Cancrinite - Vishnevite
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