Question

a mixture of large grain and small grain crystals in rocks are referred to as ______. vesicular obsidian porphyritic

Explanation:

• Vesicular texture in rocks has gas - filled holes (vesicles).
• Obsidian is a volcanic glass with no crystals or very tiny ones.
• Porphyritic texture has a mixture of large (phenocrysts) and small (groundmass) crystals.

Answer:

porphyritic