the Mammoth Cave's "Great Onyx"

The "Great Onyx" in Mammoth Cave is a large, striking formation of layered, colorful mineral deposits that resemble onyx gemstone. Formed over thousands of years through slow mineral deposits from dripping water, it features bands of black, white, and brown, creating an attractive, layered appearance. This natural feature adds to the cave’s geological diversity and offers visitors a visual appreciation of the mineral-rich processes that shape underground landscapes. The "Great Onyx" exemplifies the impressive natural artistry that can develop deep within caves over millennia.