A Day in the Canyon: Abstract Art

Basalt, Yaklma River Canyon

These pieces of basalt (approximately 18 inches in length) caught my as I was exploring road cuts in the Yakima River Canyon.  They seemed to be accented by an artists brush.  Different patterns and different colors abounded in adjacent rocks.  Since the rocks were adjacent and seem to be part of the same basalt flow, why are they so different in surface color and pattern. I need to do a little research on what factors determine the color and patterns.

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