Main index --- Minerals list --- Silicates index Quartz
Name:Clear Quartz or Rock Crystal
Derivation: From "Quarz" (German)
From "krystallos" (Greek) ice
Formula: SiO2
Description: Clear quartz, or rock crystal, can be as clear as glass.

Rock crystal Clear quartz is also called rock crystal. The word "crystal" comes from the Greek for ice, since the Greeks thought that clear quartz was permanently solidified water. Crystal balls should be made of clear quartz. They often have small flaws in, which makes the ball hazy.

A quartz crystal vibrates in a very regular way. Nowadays quartz is used in most watches and clocks as a regulator.

Larger pictures of Quartz:

This is a small cluster of three crystals of clear quartz or Rock Crystal.

Quartz

This specimen is a massive piece of quartz (without crystals). The second photo shows how transparent it is.

Quartz

Quartz