260 MINERALOGY-, 



existing lietweeii the system in whicli a liaineral crystallizes, its com- 

 position, and its atomic weight. A preliminary exposition only. G. A. L. 



Squire, Lovell, Jim. Some observations on the Mag^esite of Silesia. 

 Trans. R. Geol. Soc. Cormuall, vol. ix. part 1, pp. 59-70. 



The magnesite, or native. carbonate of magnesium, occurs in nests in 

 serpentine, close to the surface. The principal workings are near the 

 village of Baumgarten. The mineral is either quarried or extracted 

 from shafts about 10 or 15 ft. deep. It is used for making carbonic 

 acid gas for aerated waters. The author considers that the magnesite 

 has been formed in situ by the decomposition of serpentine under 

 atmospheric agencies. C. L. N. F. 



Stelzner, A. [Trapezohedral Quartz.] JSf. Jalirh. Heft ix. pp. 959, 

 960. 



Letter supporting the anther's views, on the genesis of trapezohedral 

 quartz, against remarks by Prenzel. It had been said that no com- 

 pounds containing fluorine, chlorine, or boron occurred in the Schnee- 

 berg lodes, with the trapezohedral quartz ; and the object of the present 

 letter is to show that fluor-spar is found there, F. W. B,. 



Streng, Dr. A. [Garnets ; ApophvUite.] iV. Jalirh. Heft iv. pp. 393, 

 394. 



On the occurrence of garnet at Auerbach in crystals showing com- 

 bination of 00 . 202 . 00 02 . 00 Of. Also describes the occurrence of 

 apophyllite in colourless crystals on wollastonite, from a limestone- 

 quarry at Auerbach. The apophjdlite resulted from the alteration of 

 wollastonite. F. W. R. 



. Ueber die Kryetallfoim und die Zwillingsbildungen des 



Phillipsit. [Crystalline Form and Twinning of Phillipsite.] N, 

 Jalirh. Heft vi. pp. 585-595 ; plate. 

 " Crystallographic description of phillipsite from the basalt of Sirgwitz, 

 near Lowenberg, in Lower Silesia. The crj^stals belong to the rare 

 Nidda type. The author argues in favour of referring phillipsite to 

 the monoclinic system, just as Des Cloiseaux has transferred harmo- 

 tome to that system. The characters of the twin crj'stals are discussed 

 in detail. F. W. R. 



. [Pyrrhotite ; Stilbite.] N. Jahrh. Heft vii. pp. 729-731. 



Refers to the occurrence of magnetic pyrites, mistaken for mar- 

 casite, with red silver ore from Andreasberg, in the Hartz. The 

 crystals of magnetic pyrites are notable for exhibiting prismatic faces 

 striated vertically by an alternating combination of oo P and cc P2, 

 thus suggesting twinned rhombic prisms. Also notices the occurrence 

 of desmine at Auerbach. F. W. R. 



Struver, Giov. Sulla Gastaldite, nuovo minerale del gruppo dei 

 bisilicati anidri. [Gastaldite, a new Mineral Of the Anhydrous 

 . Lisilicate Group.] Borne. 



