As alchemy was very much a magic and emotional take of chemistry. I don't know if this is alchemy, this seems more like bringing an element of Sci-fi into the fantasy setting. Which certainly is fine in some settings, but this seems to be based on a clear vanilla D&D troll. I would be interested to hear what this community has to say about the realism, physics and chemistry versus the themes of a game. For example clever players may use mend spells to take the natural cracks out of a material such as flint to make it super hard and and sharp. Does this fit with the theme of the game.
At anyrate nice idea, simple, compact back story and easy to slide into a game. You stick in some other animal if you don't like trolls, hydra rations or something.