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Nepheline

Nepheline phonolite
Huevin (Schlossberg Brüx), Czech Republic
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
  
  PPL

Crystal centre-left: section ∥ c, diagonal position; crystal centre-right: section oblique to c (A)
Section ∥ c, diagonal position (B)
Basal section (orthogonal to c) (B)
 
 
  +Pol

Crystal centre-left: section ∥ c, diagonal position (max Δn); crystal centre-right: section oblique to c (A)
Close-up of previous image (A)
Crystal centre-left: section ∥ c, diagonal position, +1λ (A)
Section ∥ c, diagonal position (max Δn) (B)
Section ∥ c, diagonal position, +1λ (B)
Basal section (orthogonal to c; isotropic section) (B)
 

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Width of view   Pol orientation
 
 0.5 mm
   
 W-E
     

Nepheline
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