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Overgrown Stone is a new block to Biomes O' Plenty. It "replaces Smoldering Grass Blocks" according to the github update log, even though normal stone doesn't appear in the Nether. Like normal grass, the color of Overgrown Stone's grass cover will change based on its biome.
Although Overgrown Stone can be mined with a pickaxe, it will drop Cobblestone when broken unless the pickaxe is enchanted with Silk Touch.
- The overgrown stone block is the ground block of the new Crag biome.
- In Alps Foothills biome, this block generates with snow on top.