Employee stated he was turning 2 xcut left. The top started to vibrate as the miner started to cut. A piece of rock fell out of the top, striking his hat and then struck his little finger on his left hand. The rock was 7 1/2 long, 2 1/2 wide and 0 to 1 1/2 thick. this occurred 200' from #1 entry 100' outby spad 11846, 2 break left on the east section.