Toppling stones

Since you are adding mountains and goats in a later update, these toplling stones could make the taller mountains harder. The stonnes should have gravity and if it falls on you it will deal damadge. breaking one should give 2-3 cobblestone,0-1 iron and 1-2 coal. This addition will make people want to go to the mountains and be careful going to mountains. Please tell me what you think about this addition idea!