4^6 Analyfis of an Ore of Iron, &?c. 



■RiaUcable; and was judged by an eminent iron niafter, to whom I fI!e^v•ed it, to be iiiter- 



mediafe between cnide and good wrought iron. 



From tlie foregoing experiments, the component parts of tliis ore, and their propor- 



hons, niny be afTig'ied as follows : 



One hundred parts contain 



Of oxygen, 281 



lion, - d^ 



Alumine, - i| 



Silex, - 4l 



^ From this analyfis, we may infer, alfo, the proportion of foreign ingredients, in the- 



metallic button obtained from the ore. For, fince 200 grains of the ore contain only 



132 of teal metal, while the weight of t!ie iron obtained was 444, it appears that the 144 



parts of metal maft contain 12 of foreign ingredients, or 8j per cent. 



The general refults of the foregoing analyfis having been commuriicated by my father 



to Mr. HatcheXt, along with a fpecimen of the ore, he was favored in reply with tire 



following interefting remarks. 



" The fubflance which Mr. JVHUam Henry has had the goodnefs to fend me by your 



hands is, as he fuppofes, one of the fpecies of the cifen-glimmer. The firft, (called by the 



Germans eifenmannj is of a fteel-grey colour and luftre. It does not feel unftuous, nor 



ftain the fingers. The fecond (called eifonrahm) of which your fpecimen is a varietv, is 



to be found defcribed in the following authors. 



Brann und Rother Eifenrahm "1 Widenmarm's 



Ferrum Ochraceum Rubrum Inquinans >Handbuch der 

 Mine de Fer Micace Rougeatre J Mineralogie, p. 807 



Haematites Micaceus, Wallerii, fpec. 333; alfo in Muf, Lefk. of Xarften, torn. 2. 



p. 453; Werner's Verzeichnis, 1 Band. p. 153; Catalogue de Raab, torn. 2. p. 265-269; 



and Kirwan, ift edit. p. 275. The laft mentioned author fays, that it is combined with 



plumbago; but this appears to be a mere conjefture, without foundation. In his 2d. 



edit. vol. 2, p. 166 and 172, he confiders the eifenmann and eifenrahm among thofe 



ores of iron, which confift of iron, combined with from 24 to 36 per cent, of oxygen. 



Although I am not acquainted with any regular analyCs of this fubftance, yet, frora 



what is known at prefent, there is every reafon to believe that your fon is in the right. 



" The various writers, on the fyflematical arrangement of minerals, have feparated 



the ores of iron, like thofe of other metals, according to their different ideas ; and appear 



in general, too much to have overlooked the chain, by which nature connects her pro- 



dufts. This chain is peculiarly obfervable in the mineral kingdom, and is moft evident 



in the natural metallic compounds called ores. The grey iron ores, for inftance, may 



be regarded as differing from each olher» only in the proportion of oxygen, by which 



they 



