210 PETROLOGr. 



blende and augite intimately associated, and passing into a substance 

 like uralitc ; whilst the altered diorite also contains calcite and a 

 mineral resembling serpentine. P. W. E. 



Laufer, E. Die Quarz-Porpbyre der XJmgegend von Ilmenau. 

 [Quartz-porpbyries of Ilmenau.] Zeitsch. deutsch. geol. Ges. 

 Bd. xxviii. Heft 1, pp. 22-48. 



Gives descriptions and analyses of 21 porphyries from the district, 

 grouped under quartz-porphyries, or those with distinct quartz-crystals, 

 and felsite-porphyries, in which no quartz is visible to the eye, but 

 whose paste contains more silica than is present in felspar ; indeed the 

 quartz is often visible in the microscope. They are chiefly of Rothlie- 

 gende age, though not necessarily synchronous ; e. g. the Hermannstein 

 porphyry seems to cut through that of Kickelhahn. I^one contain 

 titanic acid, though this is often present in the porphyrites. There are 

 veins with fluor, barytes, and manganese ; but these arc later introduc- 

 tions. E. B. T. 



Luedecke, Otto. Der Glaukophan und die Glaukophan fUhrenden 



Gesteine der Insel Syra. [Glaucophane-rocks of Syra Island.] 



Zeitsch. deutsch. geol. Ges. Bd. xxviii. Heft 2, pp. 248-292, pi. 7. 



The microscopic structure and chemical composition of glaucophane, 



omphacite, &c. are investigated, and the same methods extended to 



many varieties of rocks occurring in the island. Among these are 



described glaucophane-eclogite, omphacite-paragonite-rock, glauco- 



phane-epidote-rock, omphacite-zoisite-gabbro, smaragdite-chlorite-rock, 



&c. E. B. T. 



Malherbe, Renier. De I'analyse des Charbons. [Coal analysis.] 

 8vo. Liege. 



Mello, Rev. J. M. A Chapter in the History of Eock Structure. Sex. 



Goss. No. 137, pp. 101-103, woodcuts. 

 Illustrates the mineral and microscopic examination of rocks by 

 means of a specimen of granite. 



Morgan, Alfred. A Note on Itacolumyte, or flexible Sandstone. 



Proc. Liverpool Geol. Soc. vol. iii. pt. ii. pp. 148-151. 

 Occurs in Brazil and S. Carolina as a micaceous granular quartz-rock, 

 said to bo associated with gold and topaz. In India, at Kaliana, 60 

 miles west of Delhi, are patches in a band of earthy cellular quartzite, 

 used for millstones, sometimes in the line of bedding, sometimes in the 

 lines of joints, probably due to the removal of cementing material by 

 water, the particles being imbedded in a paste permitting motion. 



C. E. D. 



Moss, — . A Section of Quartz-rock from Shankill, Co. Dublin, 

 exhibited at the Dublin Microscopical Club. Quart. Journ. Micr. 

 Sci. vol. xvi. p. 415. 



The rock was said to be a sandstone, consisting of rounded grains of 



