Quark has a module called Big Stone Clusters that changes how these blocks generate:
Solution 1: Change the config
To change this behavior, navigate to your config folder and open quark-common.toml. Set "Big Stone Clusters" = false at the following line:
"Big Dungeon" = true
"Big Stone Clusters" = false
Biotite = true
"Blossom Trees" = true
I installed All the Mods 6 and tested this for you; with the module disabled (as above), I found small patches of all three stone types in the biome I started in (Crag Gardens). I haven't tested other biomes.
Solution 2: Look in these biomes
Alternatively, if you want to find these blocks without changing anything, the Quark website outlines how they are generated (navigate to the World tab):
- Granite will spawn in Mountain and Hill biomes.
- Diorite will spawn in Savanna, Jungle, and Mushroom biomes.
- Andesite will spawn in Forest
Note that they will be in larger, less frequent veins.