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Chloritoid

Ottrélite slate
Ottré, Vielsalm, Stavelot Massiv, Belgium
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
 
  PPL

Variable crystal orientations; crystal in centre: section ∥ c, c ∥ pol plane (A)
Variable crystal orientations; crystal in centre: section ∥ c, c orthogonal to pol plane (A)
Variable crystal orientations; crystal in centre: section ∥ c, diagonal position (A)
Section ∥ c, c ∥ pol plane (B)
Section ∥ c, c orthogonal to pol plane (B)
Basal section (orthogonal to c) (C)
 
 
  +Pol

Variable crystal orientations; crystal in centre: section ∥ c, diagonal position (A)
Variable crystal orientations; crystal in centre: section ∥ c, diagonal position, +1λ (A)
Section ∥ c, diagonal position (B)
Section ∥c, diagonal position, +1λ (B)
Section orthogonal to c (near-isotropic) (C)
 

  Additional images

  Image comments

   
Crystal in centre: position shows colour relating to Z (min absorption)
 

Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Chloritoid
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