This is a piece of Tiger's eye from the tumbler which I didn't realise I had put in there. It's shiny!
Every so often we need to purchase a new rock Tumbler. Each time we purchase a new rock Tumbler, the company we buy from sends us rocks. We try to focus on tumbling Scottish rocks but once in a while we do tumble up one of the international ones. 
Tiger's eye is a little less tough than the agates and quartz crystals from Scotland which we polish. If we wanted to tumble up the tigers eye we would have to do it in a barrel with softer material. This means that they were sat on the side waiting to be tumbled for the last two or three years.