Webster’s Revised Unabridged Dictionary · 1913
Graystone
Gray′stone′ (·stōn′), n. (Geol.) A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt.
Webster’s Revised Unabridged Dictionary · 1913
Gray′stone′ (·stōn′), n. (Geol.) A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt.