232 MINERALOGY. 



Baumhauer, H. Die Aetzfigurcn des Magnesiaglimmers und des 

 Epidots. [Erosion-figures on Magiiesian Mica and Epidote,] 

 Sitz. math.-phys. Classe Jc. bay. AJc. Wiss. pp. 99-105 ; 2 figs. 



Hot concentrated sulphuric acid acting on magnesian mica etches 

 three-sided figures, whilst a heated mixture of finely pulverized fluor- 

 spar and sulphuric acid develops both three-sided and six-sided 

 depressions ; between these two forms all transitional stages may be 

 observed. The rhombohedral nature of the mineral is thus confirmed. 

 Pine crystals of epidote from Sulzbach were also etched. The erosion- 

 figures vary on difi'erent faces. P. W. R. 



— . Ueber die Aetzfiguren des Apatits und des Gypses. [Erosion- 

 figures produced on Crystals of Apatite and Gypsum.] Sitz. math.- 

 phy. classe k. hay. Ale. Wiss. pp. 169-177. 



The figures produced on the faces of bright well- developed crystals 

 of apatite from Sulzbach, by exposure to the action of slightly warmed 

 h}'drochloric acid for a few minutes, have been investigated, with the 

 result of showing that such erosion takes place in a manner indicating 

 a pyramidal hemihedral structure for the mineral. The same method 

 was applied to gypsum, the etching being efi'ccted with caustic potash, 

 the resulting crust of lime being dissolved off' in weak hydrochloric acid. 

 The author points out that the hemihedrism of quartz and iron-pyrites 

 has already been made out in the same manner by Leydolt and Gustav 

 Rose. H. B. 



Berwerth, F. Stangeliger Ludwigit. [Columnar Ludwigite.] Min, 

 Mitt. Heft i. p. 42. 



Note on a columnar variety of Ludwigite from Morawitza in the 

 Ban at. 



. Ein neuer Eundort von Pharmakosiderit. [New Locality of 



Pharmacosiderite.] Min. Mitt. Heft ii. p. 109. 



Describes specimens of pharmacosiderite from Konigsberg near 

 Schemnitz, the first locality in Hungary from which the species has 

 been obtained. P. A¥. E.. 



. Hyalith. Min. Mitt. Heft ii. p. 109. 



Transparent colourless hyalite occurs at Konigsberg near Schemnitz. 



. Serpentin von New Jersey. Min. Mitt. Heft ii. p. 110. 



A pale green translucent noble serpentine from New Jersey, P. S., 

 exhibited a yellowish white incrustation, which was supposed to be a 

 product of decomposition, but was found on analysis to be merely a 

 modification of serpentine. The analysis is given. P. W. R. 



. Salze von Konigsberg in P'ngarn. [Salts from Konigsberg, 



Hungary.] Min. Mitt. Heft iv. pp. 310-312. 



Analyses of two salts, reputed to be keramohalite, from Konigsberg 

 in Hungary. Both differ in composition from that species. One is 

 evidently a mixture of different salts ; the other appears to be a new 

 salt ; its formula is given as follows : — 



(SO3),;. (Al^O,), . (FeO), . (H,0), . (Aq),„,. 



F. W. E. 



