The landmark in Petrified Forest National Park called Squared Off Butte, a marker on the way to Onyx Bridge, Arizona, United States of America, North America

A section of Petrified Forest National Park called Angel Garden, northwest of the Onyx Bridge, Arizona, United States of America, North America

View from the summit of Squared Off Butte along the Onyx Trail in Petrified Forest National Park, Arizona, United States of America, North America

One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

Onyx Bridge at Petrified Forest National Park, Arizona, United States of America, North America

Ancient Indian petroglyphs along the Onyx Trail at Petrified Forest National Park, Arizona, United States of America, North America

One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

Onyx Bridge at Petrified Forest National Park, Arizona, United States of America, North America

Venetsa Cave in Bulgaria. Beautiful colorful and illuminated cave full with semiprecious onyx stones. Flowstones, stalactites and stalagmites lighted in different vivid colours

Venetsa Cave in Bulgaria. Beautiful colorful and illuminated cave full with semiprecious onyx stones. Flowstones, stalactites and stalagmites lighted in different vivid colours

Onyx, Kenya, Africa

Mexico, Puebla, Baroque Capilla del Rosario or Rosary Chapel in the Church of Santo Domingo. Ornately decorated interior with gilded stucco and onyx stonework.

Mexico, Puebla, Baroque Capilla del Rosario or Rosary Chapel in the Church of Santo Domingo with ornate interior decorated with gold leaf and onyx.