scrowln.

/skraʊl/the world > the earth > minerals > mineral deposits > [noun] > mineral incrustation
1778 W. Pryce 99 What they call a Scrowl of the true Lode in the Cross-Gossan.
1884 R. Hunt 912.
This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2018).