221 



MINERALOGY. 



[In preparing abstracts of mineralogical papers it has been thought right to 

 adhere as far as possible to whatever system of nomenclature, chemical notation, 

 and crystallographic formulae may have been used by the authors. No attempt 

 has therefore been made to secure uniformity on these points. Where two or more 

 symbolical expressions for the same thing have been used, the first has generally 

 been taken. Exceptions to the foregoing rules have in some cases been made in 

 order to avoid typographical difficulties. — F. W. R.] 



AcHiABDi, A. d'. Delia Natrolite (Savite) e Analcima di Pomaja. 

 [On Natrolite and Analcime from Pomaja.] Boll. R. Com. geol. 

 ItaL pp. 1G3-165. 

 Supposes that these minerals have been formed by aqueous extrac- 

 tion from labradorite, which, by the abstraction of soda, alumina, and 

 lime, might be left as steatite, a third mineral associated with them. 



E. B. T. 



. Le Zeoliti del Granito elbano. [Note on Zeolites in Granite 



of Elba.] Boll. B. Com. geol. Ital. pp. 306-312 (2 woodcuts of 

 crystals). 

 The author determined the presence o^ stilbitc and heulandite in 

 Elban granite ; figures of the crystalline form of the latter are given ; 

 and it is suggested that they represent a triclinic variety. What has 

 been since named Foresite by Yom Bath was determined previously by 

 the author as allied to Coolceite, E. B. T. 



Andrews, Prof. Thomas. On the Composition of an Inflammable 



Gas issuing from below the Silt-bed in Belfast. Proc. Belfast 



Nat. Hist, (fe Phil. Soc, Session 1873-74, pp. 93, 94. 



The gas was found in making a well, through 33 feet of silt and 7 



feet of gravel, to clay ; and it had accumulated at the junction of the 



silt and gravel. It consists of marsh-gas, with nitrogen, carbonic acid, 



and oxygen. W. W. 



Ai^GELL, A., Jun. Notes on the Probable Origin of Flints. Journ. 

 AVinchester Sci. & Lit. Soc. vol. i. part 3, pp. 146-151. 



The author thinks that the dark colour of chalk -flints is due to 

 organic remains, and that the layers of flints may have been produced 

 by the silicification of protoplasmic matter, which was deposited in the 

 bot;tom of the deep sea at times when the water contained hardly any 

 lime-salt in solution, from colder changes of current. Difliculties in 

 other theories are noticed. W. "W. 



Anon. [Tschermak ?] Glauberit von Priola in Sizilien. Min. 



Mitt. Heft 2, p. 179. 

 Notes the occurrence of glaubcrite with gypsum, near Priola, in 

 Sicily. The crystals exhibit the simple forms 001, 111. 



. [TscnERMAK ?] Quarz von dor Saualpe. Min. Mitt. Heft 4, 



pp. 284, 285, with 2 woodcuts. 



