3 simple suggestions

[Weralligator]

Maybe you could add a slight change that the resources inside the stone could be destroyed too? Or maybe a little higher change. Or then just have it to be a slight more powerful than a pickaxe...

"You use earth to dust on the mining stone,
but the resource inside was destroyed too!"

Or then you could also have the name of the resource too.

"You use earth to dust on the mining stone,
but the small gold nugget inside was destroyed too!"

Just some ideas.