A fine-grained metamorphic rock made up of quartz, feldspar, mica, as well as other nutrients, created by the action of invasive rock upon sedimentary rock, specifically shale.
Any of a number of contact metamorphic rocks which have been baked and indurated by the heat of invasive igneous public and rendered massive, hard, splintery, and perhaps exceedingly hard and durable.
In petrography, a dense, aphanitic stone consists of feldspar, quartz, along with other nutrients, frequently an item associated with contact-metamorphism of an intrusive stone upon shale or other sedimentary rock. Occasionally known as hornstone.
a fine-grained metamorphic stone created by the action of temperature on clay rocks