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Nepheline

Ijolite (nephelinite)
Kuusamo, Finland
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
 
  PPL

Variable crystal orientations (A)
Section ∥ c, diagonal position (B)
 
 
  +Pol

Variable crystal orientations (A)
Section ∥ c, diagonal position (max Δn) (B)
Section ∥ c, diagonal position, +1λ (B)
 

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  Image comments

   
 

Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Nepheline
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