Onyx Cave may refer to several things in the United States: *

Onyx Cave (Arizona) Onyx Cave is a solutional cave system with about 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 The National Natura ...

, a National Natural Landmark *

Onyx Cave (Arkansas) Onyx Cave is a small show cave located about east of Eureka Springs, Arkansas. It has been a tourist attraction since 1893, making it the oldest show cave in Arkansas. The cave does not contain onyx, but rather flowstone, also known as "cave ony ...

, a small show cave * Onyx Cave (Kentucky), a show cave * Great Onyx Cave, Kentucky **

Great Onyx Cave Entrance Great may refer to: Descriptions or measurements * Great, a relative measurement in physical space, see Size * Greatness, being divine, majestic, superior, majestic, or transcendent People * List of people known as "the Great" *Artel Great (born ...

, Mammoth Cave, Kentucky, listed on the NRHP in Kentucky *

Crystal Onyx Cave A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macrosc ...

, Kentucky * Onyx Cave (Newburg, Missouri), listed on the NRHP in Missouri * Onyx Mountain Caverns, Missouri

See also