Chrysoprase and Prase Opal from Haneti, Central Tanzania
Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.
Gem-Quality Yellow-Green Haüyne from Oldoinyo Lengai Volcano, Northern Tanzania
Yellow-green to green-yellow gem-quality haüyne was found for the first time in an alkaline plutonic rock.
Hackmanite/Sodalite from Myanmar and Afghanistan
Significant amounts of gem-quality sodalite/hackmanite—some unusually transparent—have been produced.
Rubies and Fancy Sapphires from Vietnam
Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.
Reflectance Infrared Spectroscopy in Gemology
External reflectance infrared spectroscopy permits a very rapid and nondestructive determination of the species of a mineral.
Opals from Opal Butte, Oregon
Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
Amethyst Mining in Brazil
Brazil is currently the leader in overall production of amethyst.
The Sapphires of Penglai, Hainan Island, China
The sapphire deposit at Penglai, on Hainan Island, is potentially the largest in China.
Gem-Quality Green Zoisite
A new transparent, gem-quality green zoisite has been discovered in the Merelani Hills of mineral-rich Tanzania.
Sunstone Labradorite from the Ponderosa Mine, Oregon
The Ponderosa mine is now producing commercial quantities of the gem-quality labradorite feldspar known as sunstone.