crystalline

consisting of or containing or of the nature of crystals; "granite is crystalline"

distinctly or sharply outlined; "crystalline sharpness of outline"- John Buchan

transmitting light; able to be seen through with clarity; "the cold crystalline water of melted snow"; "crystal clear skies"; "could see the sand on the bottom of the limpid pool"; "lucid air"; "a pellucid brook"; "transparent crystal"