Emily Dickinson Lexicon

POR'CEL-LA-NITE, n.

A silicious mineral, a species of jasper, of various colors. It seems to be formed accidentally in coal mines which have indurated and semi-vitrified beds of coal-shale or slate-clay. It is sometimes marked with vegetable impressions of a brick red color. – Kirwan, from Peithner. Cyc. Cleaveland.