Why the basic tools fail
The official Crackstone material distinguishes it from ordinary terrain: Shovel and regular Gun cannot damage it. That is why repeatedly trying the starting tools does not solve the problem.
Unlocking an advanced option
Rocket Launcher appears in the collected Research and Crackstone sources as one tool that can damage Crackstone. Do not turn it into a universal or exclusive answer; the official wording supports a broader class of advanced digging tools.
What lies beyond it
Community discussion connects Crackstone barriers with access to areas related to artifact or Relic exploration. Demo-era posts may use older terms and routes, so current Early Access locations and drops are 待确认.