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Melilite (Gehlenite - Åkermanite)

Nepheline-melilite hauynophyre
Horberg, Kaiserstuhl, Germany
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
  
  PPL

Sections ∥ c, diagonal position (large crystal) (A)
Section ∥ c, diagonal position (large crystal) (B)
 
 
  +Pol

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

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Width of view   Pol orientation
 
 1 mm
   
 W-E
     

Melilite (Gehlenite - Åkermanite)
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