Tiny Tuesday: The Mineral World

Is it the moon over Annapurna?  The north face of the Eiger?  Perhaps Everest at night?  No, it's not even Roseberry Topping.  Some crystalline rocks that I used to have at the bottom of the tank in the days when I used to keep tropical fish.  They're much tinier than they look.

With thanks to host Thisislife for the Tiny Tuesday challenge this week.