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Kyanite

Pyrope-kyanite-phengite-quartz rock
Coesite-bearing unit, Dora Maira Massif, Western Alps, Italy
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
  
  PPL

Section approx orthogonal to c (A)
Section approx orthogonal to c, rotated +45° from previous position (A)
Section approx ∥ c (B)
Section approx ∥ c, close to (100) (C)
Section approx ∥ c, close to (100); rotated -45° from previous position (C)
Variable crystal orientations (D)
 
 
  +Pol

Section approx orthogonal to c (A)
Section approx orthogonal to c, +1λ (X′ ∥ Zcomp) (A)
Section approx orthogonal to c, X′ ∥ pol plane (ext position) (A)
Section approx ∥ c (B)
Section approx ∥ c, close to (100); Z′ ∥ pol plane (ext position) (C)
Section approx ∥ c, close to (100), rotated -45° from previous position (C)
Section approx ∥ c, close to (100); +1λ (Z′ ∥ Zcomp) (C)
Variable crystal orientations (D)
 

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Width of view   Pol orientation
 
 1 mm
   
 W-E
     

Kyanite
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