moorstone

From moor +‎ stone.

moorstone (countable and uncountable, plural moorstones)

1. A type of English granite, found mostly in Cornwall. [from 15th c.]
   • 1792, James Boswell, in Danziger & Brady (eds.), Boswell: The Great Biographer (Journals 1789–1795), Yale 1989, p. 176:

     Most of them are what is called moorstone, a kind of granite, but which is so damp that it must, when built in the wall of a house, be lined with brick or other stone.

• room tones