this tourmalinated QUARTZ
that we got in the lab.
The Big Bang Theory Season 7, Episode 13
Oh, you forgot your QUARTZ.
The Big Bang Theory Season 7, Episode 13
And that stone in front--
I bet it's QUARTZ.
The Big Bang Theory Season 12, Episode 2
Okay, so it's QUARTZ.
The Big Bang Theory Season 12, Episode 2
It's a silicon dioxide crystal,
otherwise known as QUARTZ.
The Big Bang Theory Season 12, Episode 2