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Andalusite

Contact-metamorphic slate (andalusite, biotite, muscovite, quartz)
Barèges valley, Pyrenees, France
Source: Thin section collection Institut für Mineralogie und Mineralische Rohstoffe, TU Clausthal
Photos: MMR
Comments and references:
  
  PPL

Section orthogonal to c (A)
Section orthogonal to c (B)
Elongate section ∥ c, diagonal position: centre left; basal section below; oblique sections: u.r. and l.r. (C)
 
 
  +Pol

Section orthogonal to c (A)
Section orthogonal to c, +1 (b = Y Zcomp) (A)
Section orthogonal to c, +1λ (a = Z ∥ Zcomp) (A)
Section orthogonal to c (B)
Section orthogonal to c, +1λ (b = Y ∥ Zcomp) (B)
Elongate section ∥ c, diagonal position: centre left; section orthogonal to c below; oblique sections: u.r. and l.r. (C)
Elongate section ∥ c, diagonal position: centre left (a = X ∥ Zcomp); basal section below; oblique sections: u.r. and l.r., +1λ (C)
 

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Chiastolite
 

Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Andalusite
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