Ore is rock or sediment that contains minerals, typically metals. The image shows lead ore.
TEXT: http://www.syvum.com/cgi/online/mult.cgi/squizzes/science/geology1.tdf ~ IMAGE: By Rob Lavinsky, iRocks.com – CC-BY-SA-3.0, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10166822