from The Century Dictionary and Cyclopedia
- n. A variety of mica-schist, made up of quartzose material through which sericite is distributed, in the manner of muscovite in the typical mica-schist.
Sorry, no etymologies found.
The rocky cliffs, about eighty feet in height at the highest point, were formed of vertically lying slate rocks -- a very uniform series of phyllite and sericite-schist.
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