Your neat square black rocks... I think it's Columbite. Both these certainly look like it. http://commons.wikimedia.org/wiki/Fi...bite-37837.jpg http://www.ebay.com/itm/HUGE-COLUMBI...item5d3ecddf69
Your neat square black rocks... I think it's Columbite. Both these certainly look like it. http://commons.wikimedia.org/wiki/Fi...bite-37837.jpg http://www.ebay.com/itm/HUGE-COLUMBI...item5d3ecddf69
Last edited by Arty; 10-15-2013 at 10:04 PM.