blackstone
nounUK /ˈblæk.stəʊn/
US /ˈblæk.stoʊn/
A blackstone is a dark, hard rock that people use for building and making things.
The old wall was built from blackstone that had been cut into blocks.
OTHER MEANINGS
2. A black stone used in some board games as a playing piece.
He placed a blackstone on the board to mark his move.
3. A place name or surname referring to a dark rocky area.
The village of Blackstone sits near the river.
4. A type of dark stone used in jewelry or decoration.
She wore a ring set with a polished blackstone.