ˈkristələ̇n, -ˌlīn sometimes -ˌlēn, archaic kriˈstal- adjective
Etymology: Middle English cristallin, from Middle French & Latin; Middle French cristallin, from Latin crystallinus, from Greek krystallinos, from krystallos ice, crystal + -inos -ine — more at crust
1. : made of crystal
2. : resembling crystal: as
a. : transparent , pure , pellucid
the crystalline sky — John Milton
b. : clear-cut
crystalline sharpness of outline — John Buchan
3.
a. : of the nature of or relating to a crystal : formed by crystallization : having regular arrangement of the atoms in a space lattice — opposed to amorphous
b. : having the internal structure though not necessarily the external form of a crystal
granite is only crystalline , while quartz crystal is perfectly crystallized
4. of rock : composed of crystals or fragments of crystals