peastone
(ˈpiːstəʊn)
[f. pea1 + stone n.]
A variety of limestone consisting of large rounded grains like peas; also called pisolite.
| 1821 Ure Dict. Chem., Peastone, a variety of Limestone. 1876 Page Adv. Text-bk. Geol. xvii. 311 Pisolite or peastone when the grains are large and pea-like. |