granulite

Bold strokes of color enliven a picture of graphite-bearing granulite, a metamorphic rock consisting mainly of feldspar and quartz. Bernardo Cesare of Padova, Italy, magnified the rock—collected in Kerala, India—2.5 times and earned eighth place in the Small World photo competition.
http://news.nationalgeographic.com/news/2011/10/pictures/111006-nikon-small-world-microphotography-competition-science/?source=hp_dl2_news_micro20111008#/best-micro-photographs-copepod_41524_600x450.jpg