« Previous | Next »

This is a thin section of diabase, a type of basalt that is coarse-grained; meaning it has lots of larger mineral crystals in it. It has more and larger crystals because it cooled slower than most pillow basalts, which are finer-grained. The arrows show olivine and plagioclase. Photomicrograph by Mike Perfit, U. Florida.

« Back to today's update