| Emmonsite | |
|---|---|
Emmonsite. Locality: San Miguel Mine, Moctezuma, Municipio de Moctezuma, Sonora, Mexico. Size: small cabinet, 6.3 x 4.1 x 1.1 cm. |
|
| General | |
| Category | Mineral |
| Chemical formula | Fe2(TeO3)3·2(H2O) |
| Strunz classification | 04.JM.10 |
Emmonsite, also known as durdenite, is a mineral with the formula: Fe2(TeO3)3·2(H2O).[1][2]
Emmonsite forms triclinic crystals.[1] It is of a yellowish-green color, with a vitreous lustre,[1] and a hardness of 5 on the Moh scale.[3] It was named for the American geologist, Samuel Franklin Emmons, (1841–1911), of the United States Geological Survey.[1][3] Emmons discovered it in 1885, and he named the mineral durdenite.[2]
It is categorized variously as an oxide, a tellurite, or a tellurate.[2][3]
Emmonsite is found, often with quartz or cerussite, in the Tombstone, Arizona area.[3] This rare mineral has been found, in 2010, in Sonora, Mexico.[4] It is also associated with native tellurium, tellurite, gold, pyrite and a variety of rare tellurium minerals.[1]