Onyx Cave (Arizona)

Onyx Cave
LocationSanta Rita Mountains, Santa Cruz County, Arizona
Coordinates31°43′3″N 110°46′9″W / 31.71750°N 110.76917°W / 31.71750; -110.76917
Length0.5 miles (1 km)
GeologyPermian limestone
Entrances1
AccessGated

Onyx Cave is a solutional cave system with about 0.5 miles (0.8 km) of passages formed in Permian limestone in the Santa Rita Mountains of Arizona. It is part of the Coronado National Forest. It was designated a National Natural Landmark in 1974.

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