ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Polarised light micrograph of Hornfels. Hornfels is a dense, hard rock created by contact metamorphism. There are many varieties, but all are characterized by small component mineral grains of approximately equal size, and a lack of banding or foliation. Cordierite is often present as irregular included crystals. Horizontal size of ths this section 1.2mm.
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