Download e-book for kindle: Apatite: Its Crystal Chemistry, Mineralogy, Utilization, and by Duncan McConnell B. S., M. S., Ph.D. (auth.)

By Duncan McConnell B. S., M. S., Ph.D. (auth.)

ISBN-10: 3709183146

ISBN-13: 9783709183144

ISBN-10: 3709183162

ISBN-13: 9783709183168

The education of a quantity in this subject used to be undertaken with a few hesitancy on my half as the ramifications of the mineralogy of apatite contain either bio­ logical and actual sciences in very problematic methods. This hesitancy can have arisen partially from the conclusion that substantial ability will be required in an effort to extract the which means from the millions of papers that experience seemed in the previous 20 years; the duty of trying to extract and gather the usable info appeared tremendous. vastly including to the trouble used to be the truth that a substantial part of those magazine articles comprise not anything of worth and extra confuse a most intricate subject. however, it used to be notion that a few of my formal schooling within the bio­ logical sciences, which has been drastically prolonged and augmented in past times fifteen years, may be built-in with my extra wide schooling and adventure in chemistry, crystallography, mineralogy, geology and physics that allows you to seasoned­ duce whatever that will relate to the mineral apatite and its super diversified occurences in nature. even as it appeared necessary to indicate many of the many very important features within which this information bears on geology, agriculture, chemical engineering, drugs and dentistry.

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Extra resources for Apatite: Its Crystal Chemistry, Mineralogy, Utilization, and Geologic and Biologic Occurrences

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At 27° C this apatite was found to be diamagnetic, presumably because of its very low iron and manganese contents. The melting points for synthetic apatites have been determined by use of a hot-stage microscope [15] with these results (two determinations each): Hap Fap Cl-ap Sr-Hap 1614°, 1615°, 1612°, 1670°, 1614° C 1622° 1612° 1670° Two indistinct cleavages, one parallel and one perpendicular to the basal pinacoid, may influence to some extent the relative intensities of diffraction maxima because of preferential orientation of grains during preparation of x-ray patterns by the powder method.

11 and 12). Comprehensive coverage of the synthetic analcgues of fluor-, chlor-, and hydrox:yapatites is beyond the scope of this work - particularly inasmuch as many of these substances are more closely related to pyromorphite, mimetite and vanadinite. 3. 39 [IV]) except for germanium, tungsten and uranium. Under natural conditions it is questionable whether Ge or W would enter apatite in amounts greater than traces except under extraordinary conditions of paragenesis. Uranium is discussed further under phosphorites.

Phosphors Development of the fluorescent lamp provided impetus for the extensive investigation of phosphors which began about 1935. The earliest efficient conversion of electrical energy to ultraviolet radiation in a low-pressure mercuryvapor discharge tube and its further conversion to visible-range radiation through fluorescence, was not demonstrated by use of a phosphate phosphor, however, but through a zinc silicate comparable with willemite. The first white - actually a blending of several light colors - lamp utilizing a single-component phosphor depended upon proper ratios of Zn, Be, and Mn as a silicate.

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Apatite: Its Crystal Chemistry, Mineralogy, Utilization, and Geologic and Biologic Occurrences by Duncan McConnell B. S., M. S., Ph.D. (auth.)

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