(n.) Calcium fluoride, a mineral of many different colors, white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor.
Example Sentences:
(1) Animal experiments showed that calcium fluorite can induce only a foreign body reaction in the lungs; the fibrous nodular lesions induced by the fluorite mine dust are due mainly to its silica component.
(2) On the basis of the investigations a complex filter made of silver plated minerals--dolomite and fluorite--has been developed.
(3) NMR analysis showed FAP or FHAP as a reaction product of fluoride uptake under all conditions, regardless of whether CaF2 was formed, unambiguously demonstrating fluorite as an additive rather than substitute form of F reactivity.
(4) The occurrence of fluorite in mysid statoliths confirms the earlier interpretations based on insufficient documentation.
(5) It was also demonstrated that having engulfed calcium fluorite, silica, or fluorite mine mixed dust, PAMs release an elastase-active substance.
(6) Use of acetyl hypo[18F]fluorite gives [18F]-4 in 60 min in 20-42% radiochemical yield.
(7) The environmental survey included measurements of the dust respirable fraction and fluorite concentration in the air.
(8) The authors suggest that the emphysematous lesion seen in autopsy material of pneumoconiosis of fluorite mine workers may be caused by calcium fluorite and silica.
(9) A compact autosynthesizer was developed and used successfully for the production of 2-deoxy-2-[18F]fluoro-D-glucose [18FDG] from gaseous acetyl hypo[18F]fluorite.
(10) X-ray diffraction patterns show that the statoliths of marine mysid crustaceans are composed of fluorite, and that this mineral is also a principal phase of the gizzard plates of some tectibranch gastropods.
(11) At pH's less than 5.0 to 6.0 the solubility product of fluorite, and not that of fluorapatite, is the governing principle under the experimental conditions used.
(12) It was demonstrated that either silica or the mixed dust of a fluorite mine can stimulate pulmonary alveolar macrophages (PAMs) to release fibrogenetic factors in vitro, but calcium fluorite cannot.
(13) Furthermore, fluorite (CaF2) makes the slag more fluid.
(14) The authors investigated the influence of working conditions--with particular reference to dust and fluorite pollution--on the epidemiology of chronic bronchitis in 197 subjects working in a fertilizer producing plant in Krakow (Poland).
(15) The pathogenicity of mixed dust from a fluorite mine was studied by animal experiments and in vitro tests.
(16) The unit has been similarly configured and programmed to synthesize 2-deoxy-2-[18F]fluoro-D-mannose (48% EOB), 3-(2'-[18F]fluoroethyl)spiperone (29% EOB), and [18F]fluoroacetate (66% EOB) from aqueous [18F]-fluoride ion, and 2-[18F]FDG from gaseous acetyl hypo[18F]fluorite (20% EOB).
(17) All sample fumes from low hydrogen welding in several atmospheric conditions contained fluorite (CaF2).
Hornblende
Definition:
(n.) The common black, or dark green or brown, variety of amphibole. (See Amphibole.) It belongs to the aluminous division of the species, and is also characterized by its containing considerable iron. Also used as a general term to include the whole species.
Example Sentences:
(1) There's limestone and sandstone to the north, but Aswan's bedrock is hornblende granite.
(2) Xanthine oxidase was immobilized on cellulose, Sepharose, hornblende, Enzacryl-TIO, and porous glass.
(3) These fungi were incubated with the following iron-containing minerals: augite, hornblende, biotite, magnetite, hematite, and the igneous rock granodiorite.