Which is the correct word between stone and stones to fill the blank in following sentence ?
If you turn the corner you will find a house built of _______.
Actually I read two sentences one is given above and the second one was this
He had a simple house built of stones he'd carried from his rocky fields.
The first sentence is in my book in which stone is used but the second sentence which uses stones, I found it on internet. My book says stone is correct in that sentence, if stone is correct then is stones in second sentence wrong ?