Firestone

I never knew Firestone was so hard to mine. It's the strangest mineral I've ever encountered. If this phospine bearing rock meets a spark of contacts with water, it explodes. Strange mineral.

Only the shunned people mine firestone. It's is very hard to mine and very dangerous.

In the 2nd interval, there is only one firestone mine left on Pern. Until Miner Cristov, High Reaches Wingleader D'vin, Harper Kindan, Harper Pellar and Halla found a new type of Firestone. it was the Firestone where the Fire-lizard got their name from. It was not the highly volatile rock that hurts the dragon's throat.

This mineral is found near shorelines. The sea probably turned it blue-greenish in color. The dragons must take time to chew but it sustains a longer flame.