A metamorphic rock containing quartz and mica which resembles slate in being easily split.
- Corundum occurs as an accessory mineral in some metamorphic rocks, such as mica schist, gneiss, and crystalline limestone.
- The slate, where thermally metamorphosed, has been turned into siliceous hornfels and mica schist.
- The subsurface investigation indicated that there was a relatively thin layer of fill - between 5 and 12 ft thick and consisting of mica schist and schistose gneiss - overlying very competent rock.
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