Hello, I think there is no andesite, diorite or granite generated in Realistic World. I played a long time and I didn't see any of these rock underground. I'm using Quark for 1.12.2 version 1.5 revision 129.

Set up with only quark and forge, default settings for everything, realistic world, seed Quark I found andesite in a ravine around -214 50 212, and some more around -29 57 53
Granite around -120 48 -438
I did see diorite but missed taking down coordinates (it was around a surface lava lake less than 400 blocks from spawn though)

You may want to check that seed in case your quark settings and/or another mod are preventing andesite/diorite/granite from spawning, but it's definitely spawning in Realistic under at least some circumstances