DAUBREE ON ARTIFICIAl, APATITE. 31 



crystallization is obtained. It is probable that in like manner crystals 

 may be prepared from an acid, an alkaline, an alcoholic, or an ethe- 

 real solution ; and that the separation of two bodies by alteration of 

 the solvent, so often employed in organic chemistry, may thus be 

 combined with a separation by means of crystallization. 



The above-mentioned crystals were identified with the minerals 

 without the aid of chemical analysis ; but as in each experiment the 

 number of possible results was limited, and as the crystals agreed in 

 their general chemical deportment and in their physical properties, 

 as well as in their mode of aggregation and geometrical forms with 

 the minerals named, chemical analysis could hardly have increased 

 the certainty of my conclusions. 



[A. W. W.] 



On PsEUDO-APATiTE. By C. Rammelsberg. 



[Leonliard u. Bronn's N. Jahrb. f. Min. u. s. w. 1853, p. 184: 

 Poggend. Annal. Ixxxv. p. 297.] 



The substance distinguished by Breithaupt as Pseudo-apatite, from 

 the Prince Augustus Mine, near Freiberg, is stated by the author to 

 be without doubt an Apatite affected by decomposition, as its ap- 

 pearance clearly shows. The analysis gave — 



Phosphoric acid '^^'^^ 1 SS-fiS 



Calcium I "^^'^^ 1 5378 



Magnesia 0*14 



Oxide of iron 1-78 



Carbonic acid (Loss) .... 4-00 



100-00 



Fluor was not determined. Of chlorine there was a trace. 



[T. R. J.] 



On the Artificial Production q/" Apatite, Topaz, and some other 

 Fluor-minerals. By A. Daubree. 



[Bull. Soc. Geol. France, Deux. Ser. tome viii. pp. 347-350.] 



After referring to his former communication on certain experiments, 

 that confirm the idea of some veins of tin and titanium ore having 

 been derived from the decomposition of the chlorurets and fluorurets 

 of these metals, M. Daubree observes, that apatite, which is rare in 

 veins of lead, copper, silver, and of most metals, but, on the contrary, 

 very commonly found with tin-ore, may have probably owed its 

 origin to the presence of the fluoruret and chlorurct of phosphorus. 



