grimstone feedback

I think the texture of grimstone can be improved. First off, i do really like how it is darker than stone and that it signifies that you are deeper in the world. However, it just kind of seems out of place in a natural setting. i feel like it looks like bricks which be be weird to find naturally. Maybe making the texture less organized would help this. I really like the variants of it. Especially the stone brick texture. I can see myself using that a lot.