Polarizing microscope picture of thin section taken in crossed polarized light. Note the characteristic twinning cross-hatching.
Rock:Nepheline syenite gneiss
Local:Rio de Janeiro, Brazil
Author:Eurico Zimbres
Free for all use
Date: 1990
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Polarizing microscope picture of thin section taken in crossed polarized light. Note the characteristic twinning cross-hatching. Rock:Nepheline syenite gneiss Local:Rio de Janeiro, Brazil Author:Eurico Zimbres Free for all use Date: 1990 [[Category:
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