hornfels
Reference work entry
DOI: https://doi.org/10.1007/978-3-540-72816-0_10823
a fine-grained granular rock formed from shales and impure limestone in contact with metamorphism (rarely regional), consisting essentially of quartz, micas, and feldspars, and rarely andalusite, cordierite, and pyroxene or amphibole. Generally is a holocrystalline rock.
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