Limestone & Peridot Ore

In the lush caves, will sometimes generate large patches of limestone (like granite or diorite would). In these chunks of limestone could generate Peridot Ore, the use of the ore is still up in the air, I'm sure someone can think of a great idea for it. With limestone, comes smooth limestone, and limestone bricks, along with its stair and slab variants. 

I also had an idea of drooping moss. Drooping Moss, a little more on the lime green color, would be a plant that would droop from the ceiling, and on top of blocks drooping down the sides. 

Thank you for taking an interest in my idea!