MINERALOGY. 223 



found 200 fathoms deep and 80 fathoms further east, on the same 

 lode. C. L. N. F. 



Aezruni, Dr. A. Ueber eine Zwillingsverwachsung des Willemit. 

 [Twins of WiUemite.] Pogg. Ann. Bd. clii. p. 281. 



A specimen from Altenberg, near Aachen, exhibited the forms 

 CO R and | R. The crystals were twinned according to the law, twin- 

 plane a face of the pyramid of the second order f P2. F. W. B. 



Atterberg, a. Om ett selenhaltigt mineral fr§,n Falu grufva. 

 [Seleniferous mineral from the Falun mine.] Geol. foren. Stock- 

 holm Forhandl. bdt. ii. pp. 76-78. 



Analysis given, and the following formula suggested : — BigPbS^. 



Barcena, Mariano. On Livingstonite, a new mineral. Amer. Journ. 



ser. 3, vol. viii. pp. 145, 146. 

 Abstract from paper in ' El Minero Mexicano/ May 1874. 



Bauer, Max. [Seebachite.] N. Jahrb. Heft 5, pp. 522-524. 



Two analyses of a zeolite from Victoria, described as Herschelite, 

 have been made at Gottingen. These lead to the formula (Na^Al^Si^O^j 

 + 12H,0)-f-3(Ca,Al,Si,0,2+12H,0); whence it is concluded that the 

 zeolite is not Herschelite, but a new species for which the name See- 

 hacliite is proposed. F. W. B. 



. Mineralogische Mittheilungen. Zeitsch. deutsch. geol. Ges, 



Bd. xxvi. Heft 1, pp. 119-198, with 3 plates (crystals). 



A continuation of the author's mineralogical communications, in- 

 cluding descriptions of rare forms of crystals of garnet, the physical 

 characters of micas, the optical properties of margarite and some other 

 mica-like minerals, a peculiar twin-striation on iron-glance, and a 

 remarkable crystal of smoky quartz from Galenstock in Wallis, appa- 

 rently exhibiting basal plane. F. W. R. 



Baumhauer, Heinrich. Die Aetzfiguren am Kaliglimmer, Granat, 

 und Kobaltnickelkiese. [Etched figures on minerals.] Sitzungsb. 

 math.-phys. Classe k. b. Ak. Wiss. Heft iii. pp. 245-251, with 

 woodcuts. 

 Descriptions of experiments in developing figures by acting on pot- 

 ash-mica with fluor-spar and sulphuric acid, on garnets with fused 

 caustic potash, and on cobalt-nickel pyrites with boiling nitric acid. 



F. W. R. 



. Weitere Mittheilungen iiber Aetzfiguren an Krystallen. 



[Etched figures on crystals.] Pogg. Ann. Bd. cliii. pp. 75-80, 



plate. 

 Observations on the alums, borax, augite, and orthoclaso. 



. Bemcrkung zu dem Aufsatzo des Hrn. Dr. F. Exncr iiber 



die Losungsfiguren an Krystalifliichen. [Etched figures on 

 crystals.] Pogg. Ann. Bd. cliii. pp. 621, 622. 

 The figures developed by etching the face of a crystal may be inde- 

 pendent of the direction of cleavage. 



