Define Vesicular and Amygdoidal structure.
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Vesicular and Amygdaloidal Textures Vesicular and Amygdaloidal Textures. ... Amygdaloids are simply vesicles that have been filled in with a secondary mineral long after the flow cooled. Such secondary minerals are commonly white: quartz, calcite, or zeolite. (A secondary mineral is one that formed after the rock originally formed.)
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