A stone generator you can build in crash landing which utilizes the water tank and gives you a convenient source of very early cobble. Requires an iron bucket and a pickaxe. :
Project EX Antimatter relays not working (1.16.5) · Issue #96 · FTBTeam/FTB-ProjectEX · GitHub
Antimatter Relay - Feed the Beast Wiki
Energy Collector | The Tekkit Classic Wiki | Fandom
Antimatter Relay - Tekkit Wiki
Anti Matter Relays - sinkillerj/ProjectE GitHub Wiki