Tiny Tuesday: Mineral?

No golf again today, with the course closed after yesterday's heavy rain, so there was plenty more time to carry on de-cluttering the study, including, for me, weeding out some of the music in my CD collection that I'm not likely to listen to again (far fewer than Tess might have thought!).

Anyway, it gave me the idea for today's challenge. As for the mineral theme, it might be that this is one of those rare CDs with a thin coating of gold rather than aluminium - though I doubt it!