Strong's #2930: krustallos (pronounced kroos'-tal-los)

from a derivative of kruos (frost); ice, i.e. (by analogy) rock "crystal":--crystal.

Thayer's Greek Lexicon:

́

krustallos

1) crystal, a kind of precious stone

Part of Speech: noun masculine

Relation: from a derivative of kruos (frost)

Usage:

This word is used 2 times:

 

Revelation 4:6: "there was a sea of glass like unto crystal: and in the midst of the"
Revelation 22:1: "of life, clear as crystal, proceeding out of the throne"