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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:
Replacement of viridine by sericite and braunite

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

Variable crystal orientations
 
 
  +Pol

Variable crystal orientations
 

  Additional images

  Image comments

   
Note the decoration of original crystal outlines by opaque minerals.
 

Width of view   Pol orientation
 
 1 mm
   
 W-E
     

Viridine
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