This photo tells us of a geological event half a billion years ago, when extreme heat deep within the Earth gave rise to this crystal formation. Like a stained-glass window, the black graphite cuts across the colorful panels of quartz and feldspar. Feldspar is the most abundant silicate (of Al, K and Na) of the Earth’s continental crust. I use photomicrographs to study rocks and minerals, not only to make images with artistic intent. In this case I actually studied - with colleague and friend Satish Kumar - this granulite rock from a working quarry in Kerala, India. The microscopic scene that we observe formed at almost 900 °C, when the feldspars crystallized together with graphite in this beautiful intergrowth. While most minerals, including all silicates, become transparent to light when thinned down at 30 micron width, some remain opaque. Graphite is among them, and this explains why it creates the black strokes in this photo. Polarized light photomicrograph; width 2,7 mm.
Speed shooting: 1/50
Focal range(mm): 0mm