488 Chronicles of Science. 



in composition with the bicarbonate of the laboratory. This mineral 

 has been met with at Chypis — under a dead tree — an aggregated 

 mass of infinitely small crystals, translucid, and of a yellow colour. 

 Analysis gives potassa 46*6 ; carbonic acid, 42*2 ; carbonate of lime, 

 25 ; carbonate of magnesia, P35 ; sand and organic matters, 3*60 ; 

 water, 7*76. This composition corresponds to the formula KC 2 + A,. 

 It is the first example of carbonate of potassa being found in nature ; 

 and, it is evidently, of recent formation. 



The Limonite of Iwaro is attributed to meteoric origin, and the 

 date assigned to its fall is the 10th August, 1841. An analysis made 

 by Kedtenbacher proves that it is formed of sand — oxide of iron and 

 oxide of manganese, with a little carbonate of lime and alumina. M. 

 Pisani conceiving that, if of meteoric origin, this Pisolitic Limonite 

 should contain nickel, and cobalt, has made a new analysis, which 

 gives : — 



Argillaceous Sand . . • . . 58' 9 



Oxide of Iron 



Oxide of Manganese 



Oxide of Cobalt and Nickel 



Alumina 



Lime .... 



Magnesia 



Water .... 



11- 

 10- 1 

 0-85 

 3- 7 

 1-45 

 0-72 

 13-06 



At a recent meeting of the Academie des Sciences de Vienne, a 

 memoir, by M. de Zepharovich, was read — " On the Crystallization of 

 Anglesite " (sulphate of lead). The examples obtained by M. de 

 Zepharovich were from the lead mines of Schwarzenbach and Miss, in 

 Carinthia. This memoir may be regarded as a companion one to 

 the work of M. V. de Lang, upon the crystals of the same species 

 of mineral of Bleiberg.* 



The crystals obtained at Schwarzenbach are remarkable for their 

 limpidity, and for the great number of their planes, appertaining to 

 seventeen different crystallographic forms. Three of these forms 

 were new — two pyramids, and one " un doma " or horizontal prism. 



The two first forms are found equally frequent upon the crystals 

 from Miss, which, in other respects, are of a totally different type 

 from those of the crystals of Schwarzenbach. In both these localities 

 the Anglesite is found upon the Galena — more or less decomposed — ■ 

 associated with oxide of iron ; and at Miss the crystals of cerussite 

 (carbonate of lead) are evidently of two different epochs of 

 formation. 



Mr. N. Story Maskelyne has communicated to the Royal Society a 

 paper " On New Cornish Minerals of the Brochantite Group." These 

 minerals have been already noticed in our Journal. 



Professor A. H. Church has communicated a paper on the same 

 subject, entitled " On some Hydrated Cupric Oxy chlorides from 

 Cornwall " and another " On some Hydrated Cupric Oxy sulphates," to 

 the Chemical Society. - ]" 



The mineral Phosphorite, which was stated to occur in large 



* ' Comptes Rendus Academiques ' de 1850. 



f ' Journal of the Chemical Society,' March, 1865. 



