Glass Mountain, Volcanic summit in Mono County, California, US.
Glass Mountain rises to 11,128 feet in elevation, forming the northeast boundary of the Long Valley Caldera with extensive rhyolite formations.
The mountain developed through volcanic activity between 2.1 and 0.8 million years ago, creating numerous lava domes and flows across the region.
Native American tribes of the region utilized the mountain's obsidian deposits for creating tools and trading with other communities.
Access to the summit requires driving on Black Canyon Road for 13.6 miles west of Highway 120, followed by Sawmill Meadows Road.
The mountain surface contains large deposits of natural volcanic glass, with fragments of obsidian scattered throughout the landscape.
Location: California
Made from material: rhyolite
GPS coordinates: 37.77493,-118.70846
Latest update: March 4, 2025 13:07
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