There are two variations of texture of Mountain Grass block shown in item preview. Their texture changes randomly between those two options each time it is built.
Perfect for making forest glades, swamps, hills, cursed creepy lands, adventure realms, gardens and many other things that you can imagine!
How to obtain
Mountain Grass blocks are widely available in Mountain Mines and Arctic Mines as well as player-bought arctic and mountain Rooms and Realms. One can generally and naturally find these blocks on surface layers of mountains ground or surface layers of mines, but some can also be found within underground layers of some mines near gold or silver ores in Mountain Mines and Arctic Mines.
No perk is required to mine them.