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Fausset's Bible Dictionary
zekukith , from zaakak , "to be pure." Job 28:17; "the gold and the crystal cannot equal wisdom." Glass is meant, some costly goblet composed of glass and gold, such as Wilkinson says the Egyptians made (Ancient Egyptians 2:61). Κerach , literally, ice, the ancients believing rock crystal to be ice intensely congealed. In Ezekiel 1:22, "the likeness of the firmament was as the terrible (rather Splendid, dazzling) crystal" (Revelation 4:6; Revelation 21:11).
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Fausset, Andrew R. Entry for 'Crystal'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/c/crystal.html. 1949.