Oh, i-it's just this
dumb CRYSTAL wand
The Big Bang Theory Season 12, Episode 2
Crystal.
Breaking Bad Season 3, Episode 11
And this is a high-pulse laser
with a BBO CRYSTAL.
The Big Bang Theory Season 12, Episode 22
He was cooking
and selling CRYSTAL meth, Susan.
The Big Bang Theory Season 10, Episode 1
It's a silicon dioxide CRYSTAL,
otherwise known as quartz.
The Big Bang Theory Season 12, Episode 2