Fig. 14. Embayment of albite-twinned plagioclase (cream) by K-feldspar (gray to black). Plagioclase also occurs as remnant islands in microcline, and the islands are in parallel optic-continuity with large plagioclase crystal outside the K-feldspar. The microcline penetrates the plagioclase along fractures. Minor muscovite (blue) occurs in the plagioclase. (From granitic rocks in Mojave Desert, California, USA.