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Viridine

Contact-metamorphic manganiferous quartzite (viridine, Mn-phlogopite, Mn-phengite, quartz, Mn-oxide)
Darmstadt, Germany
Source: Thin section collection - Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum
Photos: MMR
Comments and references:
Literature: Abraham, K. & Schreyer, W. (1975), Contributions to Mineralogy and Petrology 49, 1-20
 
  PPL

Elongate section ∥ b and c, b = Y ∥ pol plane
Elongate section ∥ b and c, c = Z ∥ pol plane
Elongate section ∥ b and c, diagonal position (A)
Elongate section ∥ a and c, a = X ∥ pol plane (B)
Elongate section ∥ a and c, c = Z ∥ pol plane (B)
Elongate section ∥ a and c, diagonal position (B)
 
 
  +Pol

Elongate section ∥ b and c, diagonal position (A)
Elongate section ∥ b and c, diagonal position, +1λ (A)
Elongate section ∥ a and c, diagonal position (max Δn) (B)
Elongate section ∥ a and c, diagonal position, +1λ; c = Z ∥ Zcomp (B)
 

  Additional images

  Image comments

   
Position shows colour relating to Y (max absorption)
 

Width of view   Pol orientation
 
 0.5 mm
   
 W-E
     

Viridine
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