different between alchemistical vs alchemystical

English

alchemistical (not comparable)

Of or pertaining to alchemists.
- 1790, Edmund Burke, Reflections on the Revolution in France
  metaphysical and alchemistical legislators

Variant of alchemistical, perhaps with intentional blend of mystical.

alchemystical (comparative more alchemystical, superlative most alchemystical)

(rare) Pertaining to alchemy.
- 2006, Marsha Keith Schuchard, Why Mrs Blake Cried, Pimlico 2007, p. 69:
  Swedenborg was stimulated by the alchemystical notions of both men, and he began to move beyond the natural to the supernatural sciences.

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