MINEEALOGY. 243 



A black slime on Keupor sandstone was found to contain calcium 

 chloride 27'15, sodium chloride 11*03, potassium chloride 1*21, 

 calcium sulphate 14-55, water and vegetable extractive matter 42*25. 

 It is the only recorded instance of native chloride of calcium in Gt. 

 Britain. Its origin is unknown. An analysis of the greyish-white 

 micaceous sandstone is also given. F. "W. R. 



Stelzner, Alfred. [Trapezohedral Quartz.] iV. Jahrb. Heft iv. pp. 

 416. 



Against the author's views on the origin of trapezohedral quartz, 

 Freuzcl has objected that this mineral is a young formation in the 

 Schneeberg lodes. Stelzner uses this argument in his own favour. The 

 quartz was contemporaneous with the fluor-spar, and was formed in 

 cavities which contained solutions of fluorine compounds. F. W. R. 



Streng, A. Ueber Augit- und Adular-KrystaUe. [Crj'stals of 



Augite and Adularia.] N, Jalirh. Heft ii. pp. 178-180. 

 Describes some remarkable crystals of augite from Nordmark in 

 Sweden, and of adularia from Cavradi in the Tavetsch, Switzerland. 



[New Mineral.] N. Jalirh. Heft viii. pp. 854, ^hh. 



Note on the cacoxene of the Bieberthal, near Giessen. Announces 

 the occurrence with it of a new mineral resembling scorodite, but con- 

 taining P instead of As. It was formerly taken for manganese-spar, 

 but has been found by A. Nies to be a ferric phosphate. F. W. R. 



Struever, G. Studi sui minerali del Lazio. [Minerals of Latium.] 



Parte I. AUi B. Ac. Line, Jan. 2 ; 2 plates. Noticed in BoU. 



11. Com. cjeol. Ital. vii. pp. 85, 86, 252, 253. 



The materials are drawn from the Spada and Riccioli collections in 



the museum of the Roman University, supplemented by the author's 



researches : the chief species illustrated are sulphur, magnetite, pleo- 



naste, HaujTie, lapis lazuli. E. B. T. 



Striiver, J. [Alban Minerals.] N. Jahrh. Heft iv. p. 413. 



Note on the author's studies of the minerals of the Alban Mountains. 



Szabo, Dr. J. [On a new Method of Determining the Species of 



Felspars in Rocks.] Pp. 88 ; 5 pis. 8vo. Budapest. 

 Depends on fusibility and flame-coloration. 



Tennant, Prof. J. Notes on the South- African Diamonds. Rep. 

 Brit. Assoc, for 1875, Sections, p. 82. 



About 10 p. c. are 1st class, 15 p. c. 2nd class, 20 p. c. 3rd class ; 

 the remainder (called *'bort") are used for cutting-purposes. The 

 value of the diamonds found from March 1867 to 1875 exceeds 

 £12,000,000. W. T. 



Thomas, J. W. On the Gases enclosed in Cannel Coals and Jet. 

 Journ. Cheiti. 8oc. ser. 2, vol. xiv. pp. 144-152. 



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