Amy, Bert and others in “The Wedding Gift Wormhole”

Amy

So, do you know what it is?

Of course I know what it is. It's a silicon dioxide crystal, also known as quartz.

Sheldon

Are you sure?

Am I sure? Is basalt a mafic extrusive of igneous rock formed by the rapid cooling of magnesium and iron-rich lava? Yeah, I'm sure.