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Corundum

Aluminous gneiss (Crn, Sil, Bt, Ksp, Rt)
Coorg terrane, Karnataka, India
Source: Thin section collection M.M. Raith
Photos: MMR
Comments and references:
 
  PPL

Section ∥ c, c orthogonal to pol plane
 
 
  +Pol

Section ∥ c, c orthogonal to pol plane (ext position)
Section ∥ c, diagonal position (max Δn)
Section ∥ c, diagonal position, +1λ
 

  Additional images

  Image comments

   
 

Width of view   Pol orientation
 
 4 mm
   
 W-E
     

Corundum
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