'Pottern ore' definitions:

Definition of 'Pottern ore'

From: GCIDE

Pottern \Pot"tern\, a. Of or pertaining to potters. [1913 Webster]
Pottern ore, a species of ore which, from its aptness to vitrify like the glazing of potter's wares, the miners call by this name. --Boyle. [1913 Webster]