In Genshin Impact, when you come across a green stone, you need to find the grass seeds first, then knock the stone or shoot it with a bow and arrow character, and the stone will crack. In addition, some greenstones are part of the stone pillar seal, which requires fire element damage to attack the stone pillar to unlock it.
The above information is for reference only. It is recommended to consult experienced players or inquire about the game official website for more accurate information.