Dunstanborough Castle, a picturesque ruin on the basaltic sea-cliffs of the Northumbrian coast, 8 miles NE. of Alnwick. Crystals of quartz found here are called Dunstanborough diamonds and amethysts.
Dunstanborough Castle
Chambers's Encyclopaedia, Volume 4: Dionysius to Friction, p. 127
Source scan(s): p. 0136