[ 234« ] 

 XXVIII. Intelligence and Miscellaneous Articles. 



ON THE COMPOUNDS OF IODINE AND PHOSPHORUS. 



B. CORENWINDER remarks that the combinations of 

 • iodine and phosphorus have been hitherto unknown, means 

 not having been found for obtaining them in a definite state and in the 

 crystalline form. A method however exists of preparing these bodies 

 crystallized. It consists in successively dissolving phosphorus and 

 iodine in sulphuret of carbon and cooling the solution. Crystals of 

 iodide of phosphorus are soon deposited, the composition of which 

 depends upon the quantities employed. 



In operating on two equivalents of iodine and one of phosphorus, 

 M. Corenwinder obtained prismatic crystals of large dimensions, of 

 an orange colour, and which by analysis gave the composition PPh. 

 This is the protiodide of phosphorus. It melts at 230° F., alters 

 by exposure to the air, and volatilizes at a higher temperature. It 

 may be advantageously employed for preparing hydriodic acid. 



By taking 3 equivalents of iodine and 1 of phosphorus and con- 

 centrating the solution, irregular crystals of a deep reddish-brown 

 colour are procured ; they have the appearance of hexagonal tables. 

 This is the deutiodide of phosphorus; it melts at about 115° F., and 

 decomposes by water, yielding hydriodic acid when heated with a 

 small quantity of liquid. 



In operating on quantities in the proportions of 1 equivalent of 

 phosphorus and 1 of iodine, crystals of protiodide are obtained, and 

 excess of phosphorus remains in the liquid. 



With 5 equivalents of iodine and 2 of phosphorus, protiodide cry- 

 stallizes first, and afterwards deutiodide, which gives the following 

 equation: 5I + 2Ph=I*Ph + lsPh. 



With 4 and 5 equivalents of iodine and 1 of phosphorus, iodine 

 is at first deposited, then crystals of deutiodide, I 3 Ph. 



By employing sulphuret of carbon as a solvent, M. Corenwinder 

 was able to obtain several other compounds, as chloride of phos- 

 phorus and sulphuret of phosphorus, &c, in crystals. — Ulnstitut, 

 7 Aout, 1850. 



DESCRIPTION OF SOME NEW MINERALS FROM NORWAY. 

 BY M. P. H. WEJBYE. 



Tritomite. — This mineral was found in the island of Lamoe, near 

 Brevig, in isolated crystals, disseminated in a coarse-grained syenite, 

 and accompanied by leucophane, mosandate, catapleite, &c. 



The crystals are regular tetrahedrons, the faces of which are dull 

 and covered with a reddish-brown crust ; the fracture is conchoidal, 

 without cleavage, and the lustre is vitreous and metallic. This 

 mineral is very harsh, its colour is a deep brown, and its powder is 

 yellowish-grey ; it is opake or translucent only on the edges. Its 

 hardness is between that of felspar and apatite, and its density is 

 4-16 to 4-66. 



Before the blowpipe tritomite whitens, exfoliates, and splits, 



