Salton Sea - Kevin Key Photography - San Diego, California
Star Trails Over Obsidian Butte

Star Trails Over Obsidian Butte

Obsidian Butte at the southern shore of the Salton Sea.

To produce this image, I shot 371 images with my Canon 6D and Tokina 17-35mm lens at 10 sec f/4 ISO 3200 and then staked them in StarStaX.

Obsidian is produced when magma cools very suddenly so that there is no time for mineral crystals to form. The resulting rock has a structure similar to glass. In ancient and modern times obsidian has been honed into ultra-sharp arrowheads, knives, and cutting tools.