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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

Section ∥ c, c ∥ pol plane: large crystal
Section ∥ c, c orthogonal to pol plane
Section ∥ c, diagonal position
 
 
  +Pol

Section ∥ c, diagonal position (max Δn)
Section ∥ c, diagonal position, +1λ
 

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Width of view   Pol orientation
 
 2 mm
   
 W-E
     

Tourmaline
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