Synonyms for Crystalline (same or very similar meaning)
WordNet sense 1 (easy to perceive; especially clearly outlined):
distinctWordNet sense 2 (transmitting light; able to be seen through with clarity):
limpid, lucid, pellucid, transparent, crystal clearWordNet sense 3 (free from cloudiness; allowing light to pass through):
clearFrom the ODE community, based on WordNetadd/edit