Quartzite, usually metamorphic rock composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by included minerals. It results from the metamorphism of pure quartz sandstone. It is most easily distinguished from sandstone by the fact that it fractures across its constituent grains of sand, while sandstone fractures along the line of the cementing material between the grains of sand.
Our collection contains the following quartzites:
| Beige Quartzite | Brown Quartzite |
| Desert Lagoon Quartzite | Emerald Quartzite |
| Flower Quartzite | Silver Quartzite |
| Yellow Quartzite | |