It's a silicon dioxide CRYSTAL,
otherwise known as quartz.
The Big Bang Theory Season 12, Episode 2
And this is a high-pulse laser
with a BBO CRYSTAL.
The Big Bang Theory Season 12, Episode 22
l, uh, went back to the CRYSTAL.
Breaking Bad Season 4, Episode 7
and I damn sure didn't say
anything about no CRYSTAL.
Breaking Bad Season 2, Episode 3
did you give them the
CRYSTAL chakra wand
The Big Bang Theory Season 12, Episode 2