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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)
Section near-orthogonal to c, (010) orthogonal to pol plane (B)
Section ∥ c, c ∥ pol plane: central crystal (C)
Variable crystal orientations (D)
 
 
  +Pol

Variable crystal orientations (A)
Section near-orthogonal to c, orthogonal to an optic axis, (010) orthogonal to pol plane (B)
Section near-orthogonal to c, orthogonal to an optic axis, c. 45° rotation from previous image (B)
Section near-orthogonal to c, orthogonal to an optic axis, +1λ (B)
Section ∥ c, c = Z ∥ pol plane (ext position): central crystal (C)
Section ∥ c, diagonal position (X-Z section, max Δn): central crystal (C)
Section ∥ c, diagonal position: central crystal, +1λ (c = Z ∥ Zcomp)(C)
Variable crystal orientations (D)
 

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Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Sillimanite
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