crystal (adj.) 1
clear, bright, transparent
Cym V.iv.81 [Sicilius, to music, as if to Jupiter] Thy crystal window ope
R2 I.i.41 [Bolingbroke to Mowbray] the more fair and crystal is the sky, / The uglier seem the clouds that in it fly
Ven 633 [Venus to Adonis, of a boar] he nought esteems ... thy soft hands, sweet lips and crystal eyne
Ven 957 [of Venus' eyelids] who, like sluices, stopped / The crystal tide