noun
- Plural of felstone; hard, fine-grained igneous rocks, typically felsite or similar crystalline stone used historically in construction and tool-making.
Usage: geological/technical term; chiefly British; archaic or specialized usage
Examples
- The ancient builders selected felstones for their durability and resistance to weathering.
- Felstones were commonly quarried in Cornwall and used for millstones.
- The geological survey identified several deposits of felstones in the region.
- Neolithic tools were sometimes crafted from felstones due to their hardness.