Limestone
A white friable rock. Might be grinded to produce catalyst.
Overview
Limestone is a Resource that can be mined in large amounts in the Sea biome. It is also sometimes found in the Ore biome, though in smaller quantities.
Because it appears naturally in more than one biome, Limestone can serve as a common material source when exploring coastal areas early on or when expanding into regions that include ore deposits.
Official description
A white friable rock. Might be grinded to produce catalyst.