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Tourmaline

Tourmaline-muscovite-chlorite 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 schist)
 
  PPL

Section ∥ c, c ∥ pol plane: crystal in centre; basal section (orthogonal to c): crystal l.r.
Section ∥ c, c orthogonal to pol plane: crystal in centre; basal section (orthogonal to c)
Section ∥ c, diagonal position: crystal in centre; basal section (orthogonal to c)
 
 
  +Pol

Section ∥ c, diagonal position (max Δn): crystal in centre; basal section (orthogonal to c, isotropic section)
Section ∥ c, diagonal position: crystal in centre, +1λ
 

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  Image comments

   
 

Width of view   Pol orientation
 
 1 mm
   
 W-E
     

Tourmaline
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