We don't have synonyms for christal yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are crystal, christ and chrismal.
(n) :
Obsolete spelling of crystal. [(countable) A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions.]
(adj) :
Obsolete spelling of crystal. [(literally) Made of crystal.]
(n) :
Obsolete spelling of crystal. [(countable) A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions.]
(adj) :
Obsolete spelling of crystal. [(literally) Made of crystal.]