Suspicious Gravel

Suspicious gravel is a fragile gravity-affected block found in various Overworld structures. It can be brushed to extract unique structure-dependent loot from it. It drops nothing if it breaks, and will break if it falls or is moved.

In Java Edition, suspicious gravel drops as an item if it falls for more than 30 seconds, which can be achieved by falling into an upward bubble column, or through two cobwebs stacked on top of each other.[1] However, it does not retain its loot. In Bedrock Edition, suspicious gravel can be obtained only through the Creative inventory, using pick block in Creative mode and commands.

The suitable tool to break suspicious gravel is shovel.