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Tourmaline

Tourmaline-chlorite-phlogopite rock
Plankogel, Carinthia, Austria
Source: Thin section collection M.M. Raith
Photos: MMR
Comments and references:
From metasomatic blackwall separating ultramafic lenses and muscovite-kyanite-staurolite schists (proximal to ultramafic rock)
  
  PPL

Variable crystal orientations; basal sections (orthogonal to c): two crystals in centre; section ∥ c, c ∥ pol plane: crystal l.l.
Variable crystal orientations; basal sections (orthogonal to c): crystals centre-right and bottom-left; section ∥ c, c orthogonal to pol plane: crystal u.l.
Variable crystal orientations; basal sections (orthogonal to c): two crystals centre-bottom; section ∥ c, diagonal position: crystal upper centre
 
 
  +Pol

Variable crystal orientations; basal sections (orthogonal to c; isotropic sections): two crystals at centre-bottom; section ∥ c, diagonal position (max Δn): crystal upper centre
Variable crystal orientations; section ∥ c, diagonal position: crystal upper centre; +1λ
 

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Width of view   Pol orientation
 
 4 mm
   
 W-E
     

Tourmaline
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