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Nepheline

Nepheline syenite porphyry (tinguaite)
Katzenbuckel, Odenwald, Germany
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
 
  PPL

Section ∥ c, c orthogonal to pol plane (A)
Variable crystal orientations (B)
 
 
  +Pol

Section ∥ c, c orthogonal to pol plane (ext position) (A)
Section ∥ c, diagonal position (max Δn) (A)
Section ∥ c, diagonal position, +1λ (A)
Variable crystal orientations (B)
Variable crystal orientations, +1λ (B)
 

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Width of view   Pol orientation
 
 4 mm
   
 W-E
     

Nepheline
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