from The Century Dictionary.
- noun Clay metamorphosed into a rock resembling porcelain or earthenware in texture and appearance.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A semivitrified clay or shale, somewhat resembling jasper; -- called also
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
semivitrified clayor shale, somewhat resembling jasper; porcelain jasper.
Sorry, no etymologies found.
The chloritization is generally accompanied by very intense silicification, with occasional evidence of porcelanite.