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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 (low-mag overview)
Section ∥ c, c ∥ pol plane
Section ∥ c, diagonal position
Basal section (orthogonal to c)
 
 
  +Pol

Variable crystal orientations (low-mag overview)
Section ∥ c, c ∥ pol plane (ext position)
Section ∥ c, diagonal position (max Δn)
Section ∥ c, diagonal position, +1λ
Basal section (orthogonal to c, isotropic section)
 

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  Image comments

   
 

Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Cancrinite - Vishnevite
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