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Andalusite

Andalusite-cordierite-sillimanite hornfels xenolith (+ biotite, corundum)
Laacher see volcanic complex
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
 
  PPL

Section orthogonal to c
Section orthogonal to c, Y and Z in diagonal position
 
 
  +Pol

Section orthogonal to c, extinction position
Section orthogonal to c, Y and Z in diagonal position
Section orthogonal to c, +1λ (a = Z ∥ Zcomp)
 

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Width of view   Pol orientation
 
 1 mm
   
 W-E
     

Andalusite
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