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Fluorapatite as a naturally occurring impurity in apatite generates hydrogen fluoride as a byproduct during the production of phosphoric acid, as apatite is digested by sulfuric acid. The hydrogen fluoride byproduct is now one of the industrial sources of hydrofluoric acid , which in turn is used as a starting reagent for synthesis of a range ...
Fluoro-chloro apatite forms the basis of the now obsolete halophosphor fluorescent tube phosphor system. Dopant elements of manganese and antimony, at less than one mole-percent — in place of the calcium and phosphorus — impart the fluorescence, and adjustment of the fluorine-to-chlorine ratio alter the shade of white produced.
Chlorite does not have any specific industrial uses of any importance. Some rock types containing chlorite, such as chlorite schist, have minor decorative uses or as construction stone. However, chlorite is a common mineral in clay, which has a vast number of uses. [9]
Gemstone meanings are inspired by everything from royal traditions and chakras to ancient cultures and spiritual thoughts. “The myriad of colors of gemstones alone transmit energy via the ...
Recently discovered deposits in China have produced fluorite with colouring and banding similar to the classic Blue John stone. [4] One source is the Deqing Fluorite Mine, in Deqing County , Zhejiang Province, [ 1 ] : 40 the only source (other than in Derbyshire) that has an ornamental craft based upon it.
Dark inclusions of aegerine in light-green apatite Sketch showing different shapes of inclusions In mineralogy , an inclusion is any material trapped inside a mineral during its formation. In gemology , it is an object enclosed within a gemstone or reaching its surface from the interior. [ 1 ]
Fluorine atoms (yellow) are arranged in octahedra around aluminium atoms (red). Sodium ions (purple) occupy the interstices between the octahedra. Cryolite occurs as glassy, colorless, white-reddish to gray-black prismatic monoclinic crystals. It has a Mohs hardness of 2.5 to 3 and a specific gravity of about 2.95 to 3.0.
Eilat stone; Epidosite; Glimmerite; Goldstone (glittering glass) Hawk's eye; Helenite (artificial glass made from volcanic ash) Iddingsite; Kimberlite; Lamproite; Lapis lazuli; Libyan desert glass; Llanite; Maw sit sit; Moldavite; Obsidian; Apache tears; Pallasite; Peridotite (also known as olivinite) Siilinjärvi carbonatite; Soapstone (also ...