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Nepheline

Nepheline syenite
Serra de Monchique, Portugal
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
  
  PPL

Variable crystal orientations (A)
Large crystal u.l.: section ∥ c, diagonal position; large crystal on right: basal section (orthogonal to c) (B)
 
 
  +Pol

Variable crystal orientations (A)
Variable crystal orientations, +1λ (A)
Large crystal u.l.: section ∥ c, diagonal position (max Δn); large crystal on right: basal section (orthogonal to c; isotropic section) (B)
Variable crystal orientations, +1λ (B)
 

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Width of view   Pol orientation
 
 4 mm
   
 W-E
     

Nepheline
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