Graham Eaton / Pebbles of semi-precious Jasper, Quartz SiO2, in shingle on a beach, Aberdaron, Wales. The jasper is present in the rocks associated with an ancient plate boundary. July
01220793
John Cancalosi / Cross section of Agate stone, Silicon dioxide, Mexico
01118209
Adrian Davies / Amethyst crystal
01037671
John Cancalosi / Detail of a slice of blue Agate, Cryptocrystaline quartz, Brazil
01118208
John Cancalosi / Crazy lace agates, cryptocrystaline quartz, Chihuahua, Mexico
01061054
Larry Michael / Semi-precious stones and glass for sale at Zion NP, Springdale, Utah, USA
01061053
Larry Michael / Semi-precious stones and glass for sale at Zion NP, Springdale, Utah, USA
01061051
Larry Michael / Semi-precious stones and glass for sale at Zion NP, Springdale, Utah, USA
01201671
Dr. Axel Gebauer / Jewellery, semi-precious stones and corals for sale at market, with a prayer wheel. Yushu, Qinghai Province, Tibet, China
