File:American journal of pharmacy (1909) (14741867376).jpg

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Identifier: americanjournal811909phil (find matches)
Title: American journal of pharmacy
Year: 1835 (1830s)
Authors: Philadelphia College of Pharmacy Philadelphia College of Pharmacy and Science
Subjects: Pharmacy Pharmacology
Publisher: Philadelphia : Philadelphia College of Pharmacy
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Pitchblende from Joachimsthal Am. Jour. Pharrn.)April, 1909. J A Piece of Pitchblende. 161 The external characters of uraninite from different localities varywithin wider limits than those of other species. In rather rare in-stances the mineral is crystallized in cubes or octohedra, but usuallyit is massive or of granular structure. Its color is grayish, greenish-brown, or black ; its lustre pitch-like or dull. The specific gravityfluctuates from 6.5 to nearly to.
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Martin Heitirich Klaproth Now a substance which exhibits such great variations in itsphysical properties must also be variable in its chemical composition,and pitchblende, as we shall see, is no exception to this rule. Thechemical history of the mineral began in 1789, when a Germanapothecary, Martin Henry Klaproth by name, discovered that itsprincipal constituent was a previously unknown metal to which he 162 A Piece of Pitchblende. (AmAprii\909arm gave the name uranium, after the planet Uranus, then recently dis-covered by Herschel. I may mention here in passing that the art of chemical analysiswas in those days almost monopolized by your profession, and thatmany of the most important chemical discoveries of the eighteenthcentury must be credited to pharmacists. But neither Klaproth nor his contemporaries who* investigatedthe new metal succeeded in obtaining it in the free or elementalstate. This was not accomplished until 1840, when the French chemistPeligot demonstrated that the su

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1909
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28 July 2014


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