For some reason can't craft fanned cobblestone ?

[Kolyenka]

So I'm trying to craft some fanned cobble and it's not working. I don't understand why not... I've got andesite sand on the left, slate gravel on the right, and peridotite stones everywhere else. I checked the handbook and both andesite sand and slate gravel can be used to craft this stuff, and as you can see in the screenshot none of it needs to be a particular kind of sand or gravel.

Does anyone know what the problem is ?

I am doing a modded playthrough but no mods that affect sand, gravel, stones, or this kind of craftable block. I can post the modlist if needed.

[LadyWYT]

7 minutes ago, Kolyenka said:

Does anyone know what the problem is ?

You can use any kind of sand, but the gravel type needs to match the rock type that you're trying to craft it with. For example, you're using peridotite here, which is an igneous rock, so you will need an igneous gravel type to craft this cobbelstone. Granite, andesite, or peridotite gravel should work.

Fanned cobblestone using sedimentary rocks will need sedimentary gravel, and metamorphic fanned cobblestone will likewise need metamorphic gravel.

[Kolyenka]

Just now, LadyWYT said:

You can use any kind of sand, but the gravel type needs to match the rock type that you're trying to craft it with. For example, you're using peridotite here, which is an igneous rock, so you will need an igneous gravel type to craft this cobbelstone. Granite, andesite, or peridotite gravel should work.

Fanned cobblestone using sedimentary rocks will need sedimentary gravel, and metamorphic fanned cobblestone will likewise need metamorphic gravel.

I never would have guessed that  Thank you so much ! 

Now to find some different gravel....

[LadyWYT]

14 minutes ago, Kolyenka said:

I never would have guessed that  Thank you so much ! 

Now to find some different gravel....

I wouldn't have guessed it either if I hadn't booted up my game and fiddled around to figure it out.  Here's to hoping you can find some suitable gravel!