Suspicious Gravel is a fragile, gravity-affected block found in structures like cold ocean ruins and trail ruins. It cannot be obtained through mining, as it breaks instantly when affected by gravity, explosions, or pistons. Unlike regular gravel, it does not drop flint or gravel when broken.
Suspicious Gravel can be brushed using a brush tool, revealing hidden loot based on the structure it generated in. Possible rewards include pottery sherds, emeralds, and other rare items. Once brushed, it converts into regular gravel. It plays a key role in archaeology mechanics and cannot be placed by players to generate loot.