amethystine

adj

1. Like amethyst, especially in colour; violet-purple.

   “His cubic forms phosphoric Fluor prints, / Or rays in spheres his amethystine tints.”

   “Certainly […] no spot more dazzlingly becircled with blue seas, amethystine peaks, and islets magically scattered on pellucid water, could have been chosen for the greatest naval battle of modern times.”