If you walk Lake Michigan’s beaches, you may come across black sand that has a hint of red it in. Oil spill? No. The black sand is actually a mineral called magnetite. Another mineral, hematite, gives the sand its red color. Magnetite and hematite are naturally occurring. They were ground into sand by the receding glaciers and occasionally find their way ashore, delivered by waves and wind. Yesterday, I shot these photographs of abstracts of sand. (Click on an image to see them larger.)
