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Andalusite

Contact-metamorphic slate (poikiloblastic andalusite, biotite, quartz)
Bosost, Arran valley, Spain
Source: Thin section collection Institut für Mineralogie und Mineralische Rohstoffe, TU Clausthal
Photos: MMR
Comments and references:
 
  PPL

Non-specific crystal orientation
 
 
  +Pol

Non-specific crystal orientation
Extinction position
Vibration directions X′ and Z′ in diagonal position
Vibration directions X′ and Z′ in diagonal position, +1λ (X′ ∥ Zcomp)
 

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Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Andalusite
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