crys·tal·line 
/ˈkrɪstələn, Brit ˈkrɪstəˌlaɪn/ adjective
/ˈkrɪstələn, Brit ˈkrɪstəˌlaɪn/ adjective 1 : clear and shining like crystal
▪ the island's crystalline waters — sometimes used figuratively ▪ a singer with a crystalline voice [=a beautifully clear voice] 2 technical : made of or similar to crystal or crystals
▪ a crystalline solid ▪ the rock's crystalline structure
▪ the island's crystalline waters — sometimes used figuratively ▪ a singer with a crystalline voice [=a beautifully clear voice]
▪ a crystalline solid ▪ the rock's crystalline structure
