crystal

Concise Bible Dictionary:

1. zekukith (Job 28:1717The gold and the crystal cannot equal it: and the exchange of it shall not be for jewels of fine gold. (Job 28:17)), probably glass highly ornamented, such as was made in Egypt: it is here classed with gold; but wisdom, the gift of God, far exceeds such things in value.

Strong’s Dictionary of Hebrew Words:

Transliteration:
zkuwkiyth
Phonic:
zek-oo-keeth
Meaning:
from 2135; properly, transparency, i.e. glass
KJV Usage:
crystal