 |
 |
 |
 Main Menu > GeoGallery > Rocks > Gneiss > Blue Quartz Veins in Gneiss 
| ||
|
Blue Quartz Veins in Gneiss The iridescent blue quartz in this folded rock formed under high temperatures produced by a continental collision 1.1 billion years ago. During a later collision, the rock was incorporated into the Appalachian Mountains.
Group: Metamorphic |
 |
|
 |