User blog comment:X-145/Mining certain blocks/@comment-74.176.247.156-20130424023001

That ore is redstone. It is used to power iron doors an can be hooked up with buttons, levers, pressure plates, and dispensers.(PC) It is currently unable to be mined because there's not an update that let's you use it. I would recommend waiting until an update where it is used before mining because mining it now will just make it disappear.