The next day they found the quartz crystals in place.

"At least we now have something to cut those quartz crystals with."

"Did you ever see so many quartz crystals in your life?"

The faces of this form are common on quartz crystals.

This kind of filter is often made from quartz crystals.

The amount of vibrations from a quartz crystal per second does not change.

Quartz crystals offer good stability and are often used for this purpose.

"This is the largest rose quartz crystal I've ever seen," he said.

By the 1930s, the electronics industry had become dependent on quartz crystals.

After the war, many laboratories attempted to grow large quartz crystals.

But my guess would be rock crystal - transparent quartz.

You know, if that really is rock crystal, it would be worth a fortune.

He found a rock crystal and pulled it out instead.

Windows of glass, rock crystal, and colored minerals were set at every level on the wall.

More and more antique rock crystal is coming on view now.

The quality of rock crystal carving seems to have deteriorated in Europe from the 18th century to the 20th.

Also on display is a collection of artworks made from rock crystal.

The feeling the little rock crystals left was not pleasant.

They wanted to sell us little pieces of rock crystal.

Behind the chrome plates is revealed a wall of rock crystal.