Volcanic Riddles for the Crowd!

Hello everyone! After a very volcanically unhectic week it will be good to bend the heads over two mind-contorting riddles. I had prepaired a Name that Volcano Riddle, but then Suzie sent me one that was so mind-boggling that I felt like a understudy Riddler. There is also another instalment of Evil Alan’s mineralogical riddles.…