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Smithsonian National Museum of Natural History


Rectangular cushion-cut colorless jeremejevite weighing 12.78 ct.
Photo by Ken Larsen. Click to zoom.
Catalog Number NMNH G10685-00
Locality Madagascar
Weight 12.78 ct

Gift of Richard and Rita Ashley in 2011.

Jeremejevite is a rare aluminum borate mineral. In 1883, colorless crystals were first identified on Mt. Soktui, in the Adun-Chilon Mountains of Siberia, Russia. It was named after Russian mineralogist and crystallographer, Pavel Vladimirovich Eremeev (Jeremejev, in German). A second occurrence of jeremejevite, blue crystals first believed to be aquamarine, was found in 1973 in Namibia. It has also been found in the Pamir Mountains of Tajikistan and the Eifel district of Germany. Jeremejevite crystals are most often found as colorless, white, or in pale shades of yellow and blue. This jeremejevite gem is cushion cut and weighs 12.78 carats with inclusions of hollow tubes that appear to have iron staining. This gem is very rare because it is unusual to find jeremejevite in such a large size. This gemstone is a major upgrade as it is the largest jeremejevite in the National Gem Collection and the first from Madagascar.



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