1. crystalline (vs. noncrystalline), crystallized, crystalised, microcrystalline, polycrystalline

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

2. crystalline, distinct (vs. indistinct)

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

3. crystalline, crystal clear, limpid, lucid, pellucid, transparent, clear (vs. opaque)

usage: 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"

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See also: crystalline (Dictionary)