| 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. |
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.
