"The sandstone formations that are prominent in the Valley of Fire are made of sand grains composed of almost pure silica. This huge dome is the finest example in the area of such a deposit."
(Text from the signage)
A bit of geeky trivia: This is the site where the death of Captain James T. Kirk was filmed.
A mountain with a drastic transition from white to red. The white color is due to silica deposits, the red due to iron.
Silica Dome and Fire Canyon, Valley of Fire State Park, Overton, Nevada.
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