Fromcrystal +‎-ly.

crystally (comparativemorecrystally,superlativemostcrystally)

1. Like or as a crystal.
   • 1820, Jane Waldie,Sketches descriptive of Italy in the years 1816 and 1817, volume 4, page320:

     It is clear, yet notcrystally transparent; and, though a deep colour, is neither green nor blue[…]

   • 25 April, 1861,George Eliot,letter to Charles L. Lewes

     There is acrystally clear river flowing by Vidauban, called the Argent: it rushes along between a fringe of aspens and willows […]

• crystally clear

• crystalline

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