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Onyx Cave
Onyx Cave (Newburg, Missouri) is located in Missouri
Onyx Cave (Newburg, Missouri)
Location in Missouri
Onyx Cave (Newburg, Missouri) is located in the United States
Onyx Cave (Newburg, Missouri)
Location in the United States
Location 14705 Private Drive 8541, near Newburg, Missouri
Area 43.7 acres (17.7 ha)
Built 1892 (1892)
NRHP reference No. 99000529
Added to NRHP May 21, 1999

Onyx Cave, also known as King Cave and Boiling Springs Cave, is a historic natural cave located near Newburg, Pulaski County, Missouri. The cave consists of the main room measuring approximately 85 feet wide, 250 feet long, and 33 feet high, and two passageways. The cave features translucent cave onyx that is pure white to cream in color, some with reddish-colored banding. Formations range from the common stalactites, stalagmites, and columns, to beautiful draperies. An 8 foot by 13 foot vertical shaft was sunk in 1892 to mine the onyx.

It was listed on the National Register of Historic Places in 1999.

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