this tourmalinated QUARTZ
that we got in the lab.
The Big Bang Theory Season 7, Episode 13
It's a silicon dioxide crystal,
otherwise known as QUARTZ.
The Big Bang Theory Season 12, Episode 2
What do we know
about QUARTZ?
The Big Bang Theory Season 12, Episode 2
Okay, so it's QUARTZ.
The Big Bang Theory Season 12, Episode 2
Quartz, from the
German "quarz"
The Big Bang Theory Season 12, Episode 2