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Chloritoid

Chloritoid-bearing mica schist
Western Alps, Switzerland
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
Partial alteration of chloritoid to sericite and chlorite
 
  PPL

Section sub-∥ c, c ∥ pol plane (A)
Section sub-∥ c, c orthogonal to pol plane (A)
Section sub-∥ c, c ∥ pol plane (B)
Section sub-∥ c, c orthogonal to pol plane (B)
Section orthogonal to an optic axis (C)
 
 
  +Pol

Section sub-∥ c, diagonal position (A)
Section sub-∥ c, one set of twins in extintion position (A)
Section sub-∥ c, diagonal position (B)
Section sub-∥ c, twinned grain partially in extinction position (B)
Section orthogonal to an optic axis (isotropic section) (C)
 

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Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Chloritoid
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