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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 Mineralogie und Mineralische Rohstoffe, TU Clausthal
Photos: MMR
Comments and references:
Replacement of viridine by sericite and braunite

Literature: Abraham, K. & Schreyer, W. (1975), Contributions to Mineralogy and Petrology 49, 1-20
 
  PPL

Section ∥ b and c, b = Y ∥ pol plane
Section ∥ b and c, c = Z ∥ pol plane
 
 
  +Pol

Section ∥ b and c, diagonal position
 

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  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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