Use "coarse-grained" in a sentence

1. I don't know how to express this; I'll explain the fact more clearly later, but in my opinion he had rather a coarse-grained intelligence, and not only had he no faith in certain good and generous feelings, but perhaps he had actually no conception of them

2. On the west bank of the Hoosack, and east base of the hill, (L) the same coarse-grained and white limestone is found, resting on the mica slate at the west of it

3. Some of the brooks entering the Waterbury, have cut their passage through the mica slate, leaving walls of 40 or 50 feet on each side, traversed by veins of a very coarse-grained granite, and often much mixed with sulphuret of iron