Geology and Mineralogy. 469 



been grouped under one name, as here proposed. — Jour. Geol., 

 vol. ix, pp. 507-511, 1901. l. v. p. 



13. Outline of Elementary Lithology / by Geo. H. Barton. 

 Pp. 112, 12mo. (Boston, 1900.)— This little work is a digest of 

 the main features of the subject of Lithology. The important 

 rock-making minerals and their properties, the names, textures, 

 and classification of rocks, are given in. synoptical form. It will 

 be found useful by students reviewing a lecture course on this 

 subject. l. v. p. 



14. Synehisite and Molybdophyllite. — A recent number (No. 9) 

 of the Bulletin of the Geological Institution of the University of 

 Upsala contains a mineralogical paper by G. Flink with notes on 

 several known species and also descriptions of the new species, 

 synehisite and molybdophyllite. 



Synchisite, from Nararsuk in southern Greenland, was earlier 

 described by G. Nordenskiold as parisite. It is now found, how- 

 ever, to be distinct. The crystallization is rhombohedral instead 

 of hexagonal and it shows no distinct cleavage. Crystals have 

 commonly the form of acute rhombohedrons. The hardness is 

 4*5 ; specific gravity 3*902; color wax-yellow. The composition 

 *CeFCaC 2 6 is deduced from analyses, the most recent of which 

 {by Mauzelius) is as follows : 



C0 2 Th0 2 Ce 2 3 (LaDi) 2 2 Y 2 3 Fe 2 3 CaO F H 2 



25-99 0-30 21-98 28'67 1-18 Oil 16-63 5-04 2'10 = 102-00 



Molybdophyllite is a new lead silicate from Langban, Swe- 

 den. It occurs in irregular foliated masses, resembling mica, 

 imbedded in granular limestone ; crystallization hexagonal ; cleav- 

 age basal perfect. The hardness is 3 to 4 ; specific gravity 

 4'717. It is colorless with pearly luster on the cleavage face, 

 elsewhere glassy. The composition R 2 Si0 4 + H 2 is given by the 

 analysis : 



Si0 2 PbO MgO A1 2 3 Na 2 K 2 H 2 

 18-15 61-09 11-71 0-46 0'82 0'69 6-32 = 99-24 



15. Crystallization of Stannite. — L. J. Spencer shows that 

 stannite crystallizes not in the tetrahedral group of the isometric 

 system as has been assumed, but in the scalenohedral group of the 

 tetragonal system, as early suggested by Haidinger. Crystals 

 from Bolivia are very near chalcopyrite in occurring forms and 

 in angles, and like it are often pseudo-cubic from twinning. — 

 Min. Mag., xiii, 54. 



16. Conehite and Ktypteite. — H. Vater shows that the supposed 

 new form of calcium carbonate, called conehite (p. 84) by Agnes 

 Kelly, is in fact not distinct from aragonite. The ktypteite of 

 Lacroix is probably also identical with the same mineral. — 

 Zeitschr. f JCryst., xxxv, 149. 



17. The Meteorite of Felix, Perry County, Alabama. — An 

 account has recently been given by G. P. Merrill of the stony 

 meteorite which fell near Felix, Alabama, on May 15, 1900. 



