364 Scientific Intelligence. 



plete accordance with the bronzite of Marburg. The mineralogical for- 

 mula, according to the analysis of Klaproth is : 



M £ S 2 



c y 



24. Nickel-glance. — This uncrystallized mineral, which Berzelius repre- 

 sents by the formula Ni S 2 + Ni As, and has till now been found only in the 

 cobalt mines of Loo in Helsingland in Sweden, has been discovered by Mr 

 Zincken, mining director of the Duke of Anhalt, Bernburgh, among the 

 old ores from the mine Albertine near Harzgerode on the Harz. Accord- 

 ing to the examination of Prof. G. Hose of Berlin, the crystals are hexa- 

 hedrons with the faces of the octahedron. Cleavage highly perfect, paral- 

 lel to the faces of the hexahedron ; lustre metallic ; colour like that of 

 arsenical pyrites ; hardness = 5.5 ; spec. gr. = 6. 097. It is found in a 

 vein with carbonate of iron, carbonate of lime, fluor spar, quartz, lead glance, 

 blende, sulphur and copper pyrites. — (Poggendorff's Annalen, vol. xiii. 

 p. 165.) 



25. Pektolite. — Under this name Prof, von Kobell of Munich (Kastner's 

 Archiv. fur Naturlehre, vol. xiii. p. 385,) describes a mineral which is 

 found on Natrolite (a variety of Mesotype) on Monte Baldo in South Ty- 

 rol/ Spheroidal shapes, composition columnar, consisting of delicate di- 

 vergent individuals radiating from a centre ; lustre pearly ; colour gray- 

 ish ; on the surface generally dull ; hardness between that of fluor spar 

 and feldspar ; spec. gr. = 2.69. 



Before the blowpipe it yields a white translucent glass. It consists of 

 51.30 Silica, 1.57 Potassa, 



33.77 Lime, 8.89 Water, 



8.26 Soda, 0.90 Alumina and oxide of iron. 



The mineralogical formula is : 



4CS2 + 3k} Ss + 6A ^ 



26. Mineralogical Literature.— -I. Dr Naumann, professor in the Mining 

 Academy of Freiberg, has published " Lehrbuch der Mineralogie" — Trea- 

 tise on Mineralogy, Berlin, 1828, by A. Rucker, in 8vo. This treatise, 

 by a scholar of the celebrated Prof. Mohs of Vienna, is one of the best 

 on that science. The crystallographic method of Prof. Naumann is eclec- 

 tic in reference to those of Mohs and Weiss, and is very good ; the sys- 

 tem is established according to the physical and chemical characters of mi- 

 nerals. He describes a multitude of varieties of crystals with the assistance 

 of 556 figures. In general the work is very classical, and deserves to be 

 recommended to mineralogists. 



2. Dr Charles Hartmann, Mining-officer in the service of his Highness 

 the Duke of Brunswick, has published Worterbnch der Mineralogie und 

 Geognosie, — Dictionary of Mineralogy and Geology. Leipsic, by Brockhaus, 

 8vo. This work gives a description of all known minerals and rocks in al- 

 phabetical order, and contains an introduction to mineralogy and geolo- 



