Millbillillie Eucrite (Achondrite). Thin section.

On this Millbillillie Eucrite thin section, two main minerals are present: low relief (LPNA)  and low birefringence plagioclase and high relief and higher birefringence pyroxene. The plagioclase has been determined with phase contrast, it is an AN85 bytownite. The pyroxene is difficult to determine with the same technique due to the ondulose extinction produced by the shocks.

  Reflection view of a thick polished section of the same achondrite meteorite.