From Starbounder - Starbound Wiki
Silver Rock is an object unobtainable by players through normal means. This item's information is present in the game files, but not intended by developers to be in players' possession.
Silver Rock is an smashable rock found underground. When smashed, it will drop 8-12 Silver Ore.
|Apex :||There appears to be silver within this fragile rock.|
|Avian :||If I break this rock I should be able to gather the silver ore within it.|
|Floran :||Glittery rock. Sssmash it!|
|Glitch :||Observant. This rock contains silver, and is covered in cracks.|
|Human :||A rock full of silver! Maybe I can break it.|
|Hylotl :||A swift blow to this rock would free the silver within.|
|Novakid :||A rock rich with silver. I should break it.|
- Rampaging Koala: Added