Why are diorite, andesite, and granite not spawning in All the Mods 6?

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:

[world]
    "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 biomes.

Note that they will be in larger, less frequent veins.