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Sillimanite

Biotite-sillimanite-cordierite gneiss
Ihosy, Madagascar
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
 
  PPL

Variable crystal orientations (A)
Variable crystal orientations; mostly sections orthogonal or near-orthogonal to c (B)
Variable crystal orientations (C)
 
 
  +Pol

Variable crystal orientations (A)
Variable crystal orientations; mostly sections orthogonal or near-orthogonal to c (B)
Variable crystal orientations; large crystals in centre cut orthogonal to an optic axis (isotropic sections) (C)
Variable crystal orientations, +1λ (C)
 

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Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Sillimanite
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