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Siderite

Siderite gangue ore
Siegerland, Germany
Source: Thin section collection Steinmann-Institut, Universität Bonn
Photos: MMR
Comments and references:
 
  PPL

Variable crystal orientations (A)
Variable crystal orientations, 90° rotation from previous position (A)
Section ∥ c, c ∥ pol plane (low-relief position; crystal in centre) (B)
Section ∥ c, c orthogonal to pol plane (high-relief position; crystal in centre) (B)
 
 
  +Pol

Variable crystal orientations (A)
Section ∥ c, diagonal position (max Δn; crystal in centre) (B)
 

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Width of view   Pol orientation
 
 1 mm
   
 W-E
     

Siderite
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