Complex sentence: In slowly cooled intrusive igneous rocks, pigeonite is rarely preserved, but textural evidence of its breakdown to orthopyroxene plus augite may be present, as shown in the accompanying microscopic image.
Split into simpler sentences: In slowly cooled intrusive igneous rocks, pigeonite is rarely preserved. Textural evidence of its breakdown to orthopyroxene plus augite may be present, as shown in the accompanying microscopic image.