I recall having heard about something similar to a "parasite crystal", but I cannot remember whether it was a book, a movie, or just my memory mixing things up. In any case, I'd gladly accept any indications of a story dealing with such a concept.

It was somewhat similar to Ice-nine, but instead of instantly crystallizing, it would slowly grow and increasingly damage the host, like some sort of "mineral cancer".

  • Mmmmh... If you can't give more details (date? Media? Plot?), I'm afraid this is too broad. For instance, here are four examples: Guilty Crown, this unanswered book-ID, this solved one, Fafner in the Azure, and I'm sure there are more... – Jenayah Aug 16 '19 at 21:31
  • I believe it was more like hard sci-fi, so Guilty Crown would probably be a bit too fancy, but to be honest, any indication of similar stories would suit me. So if you want to convert your comment into an answer, it's fine for me (assuming it's OK for the Stack Exchange, otherwise I don't mind it being closed as too broad). The question was more about "finding stories related to parasite crystals" than remembering a specific one, since my memory is too vague. – anol Aug 16 '19 at 21:39
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    Take a look at The Crystal World by J G Ballard. Does not include the term "parasite crystal" as such but objects and people do slowly become encrusted with crystal and there are parallels with the disease of leprosy rather than cancer. – skyjack Aug 16 '19 at 21:45
  • @anol recommendations are off-topic as questions, but they're welcome in chat. Don't hesitate to drop by :) – Jenayah Aug 16 '19 at 21:47
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    The Andromeda Strain also springs to mind. – Mr Lister Aug 17 '19 at 7:44