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Azurite and Malachite. Photo by Charles Tilford taken at the American Museum of Natural History, NYC, Jan. 2004

Azurite and Malachite. Photo by Charles Tilford taken at the American Museum of Natural History, NYC, Jan. 2004

minfind.com - AZURITE from Poteryaevskoe Mine, Rubtsovskoe Cu-Zn-Pb deposit, Rudnyi Altai, Altaiskii Krai, Western-Siberian Region, Russia

minfind.com - AZURITE from Poteryaevskoe Mine, Rubtsovskoe Cu-Zn-Pb deposit, Rudnyi Altai, Altaiskii Krai, Western-Siberian Region, Russia

Blue John fluorite has a zonal distribution of color, usually blue/purple belt and yellow/ white/gray band

Blue John fluorite has a zonal distribution of color, usually blue/purple belt and yellow/ white/gray band

Astrophyllite from Utah.  Astrophyllite is a very rare, brown to golden-yellow hydrous potassium iron titanium silicate mineral and of interest primarily to scientists and collectors. The crystals themselves possess perfect cleavage, and are typically left in stead, the entire aggregate often cut into slabs and polished. Owing to its limited availability and high cost, astrophyllite is seldom seen in an ornamental capacity. It is sometimes used in jewellery where it is fashioned into…

Astrophyllite from Utah. Astrophyllite is a very rare, brown to golden-yellow hydrous potassium iron titanium silicate mineral and of interest primarily to scientists and collectors. The crystals themselves possess perfect cleavage, and are typically left in stead, the entire aggregate often cut into slabs and polished. Owing to its limited availability and high cost, astrophyllite is seldom seen in an ornamental capacity. It is sometimes used in jewellery where it is fashioned into…

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