250 MINEliALOGT. 



Freiberg, Kongsberg, Tilasinwuori in Tammela, Hmorvik near Kragero, 

 Adolf-mine in Jemtland) are given. The mean of the six analyses gives 

 IFe : 1-1192 S. The formula lies between Fe' S' and Fe' S% but is a 

 little nearer the former. 36 analyses of magnetic pyrites, collected 

 from different journals, are enumerated. E. E. 



Lindstrbm, G. Analys af gadoUnit frin Stora Tima. [Analysis of 

 Gadolinite from Great Tuna.] Geol. Foren. Stockholm Forhandl. 

 Bd. ii. pp. 218-220. 



Liversidge, Prof. A. Nickel Minerals from New Caledonia. Trans. 

 Roy. Soc. JSf. S. Wales for 1874, pp. 75-80. 



Two hydrated silicates of nickel and magnesia found in small veins 

 and fissures traversing serpentine, near Mont d'Or, Noumea, N. Caledonia ; 

 one of them, first named Noumeite^ was subsequently altered to 

 Gamierite (see Geological Recokd for 1874, p. 240). The former 

 name iVowm^z^e is transferred to another amorphous mineral. 11 = 2*0 

 to 2*5 ; Sp. gr. = 2-58. Chemical comp. not uniform ; but the mineral 

 is also a hydrated silicate of nickel and magnesia, distinguished from 

 Gamierite by its much darker apple-green colour and other physical 

 properties. R. E., Jun. 



Ludwig, E. Ueber den Pyrosmalith. [Pyrosmalite.J Min. Mitt. 

 Heft iv. pp. 211-216, with fig. 



"Well-formed hexagonal prisms of pyrosraalite from Nordmark, 

 without any trace of weathering, were analyzed by the writer, who 

 shows that the iron exists only in the form of protoxide, or as a dyad. 

 Empirical and graphic formulae are given. E. W. R. 



Lundstrom, C. H. Karyinit^ nya mineral fran Langbanshyttan i 

 Yermland. [Karyinite, a new mineral from Langbanshyttan in 

 Wermland.] Geol. Foren. Stockholm Forhandl. Bd. ii. pp. 223, 224. 



Note changing the name of the mineral from Koryinite to Karyinite, 

 from KoputVos =nut-brown. 



Machattie, Dr. A. T. Native sodium nitrate, or " Caliche." Chem. 



News, vol. xxxi. p. 263. 

 Analysis of two samples of native nitrate of soda from Peru. 



Mallet, Prof. J. W. On Achrematite, a new Molybdo-arsenate of 

 Lead, from Mexico. Journ. Chem. Soc. pp. 1141-1147. 



A mineral described as a silver-ore from Mexico was found to be a 

 molybdo-arsenate of lead, with admixture of finely divided ferric 

 hydrate. The molybdate appears to exist as the bibasic salt Pb^MoOj. 

 It is associated with arsenate, or probably chloro- arsenate, of lead, as 

 in mimetite. The two compounds are supposed to exist in a state of 

 chemical combination ; and, assuming that the arsenate exists as 

 mimetite, the proportions approach to the definite atomic ratio of 3 

 molecules of mimetite to 4 of the bibasic molybdate. This is on the 

 assumption that Mo=96,,and is a hexad. If Mo = 80, and is a pentad, 

 the molybdate may exist as a chloro-molybdate, analogous in composi- 



