Name the mineral...

Mineral #9


plane-polarized view
x-polarized view

plane-polarized view - east/west orientation
plane-polarized view - north/south orientation

x-polarized view - maximum birefringence
x-polarized view - twin

Try to name the mineral by looking at the above pictures.

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If you need more clues CLICK HERE for a list of its optical properties.

 

 

 

 

 

In plane-polarized light:
  • moderate relief
  • strong pale to dark brown or green pleochroism
  • two good cleavages at 56 & 124°
In x-polarized light:
  • moderate birefringence
  • B (+ or -)
  • smooth extinction
  • inclined extinction

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