1867.] Mineralogy, Mining, and Metallurgy. 545 



when broken, and having a dull-green streak. The mineral, which 



has a very sweet taste, was found on analysis to have the following 



composition : — 



Sulphuric Acid 45*32 



Protoxide of iron 6 ■ GG 



Peroxide of irou 44 • 92 



Water 1-51 



98-41 



From this analysis the following formula may be calculated : — 



Fe 0, S0 3 + 3 (Fe 2 8 , 2 S0 3 ) + HO 



The mineral is therefore a hydrous sulphate of the proto- and per- 

 oxides of iron ; standing between iron-alum and voltaite, but related 

 much nearer to the latter than to the former, yet differing from 

 voltaite sufficiently to admit of its separation as a distinct species, 

 for which Paulinyi proposes the name of Pettkoite, after Professor 

 von Pettko.* 



In a letter addressed to Professor Dana, and published in ' Silli- 

 man's Journal,'! M. Pisani expresses his belief that the mineral 

 called Taltalite, by Domeyko, is only an accidental mixture of oxide 

 of copper, with a fibrous tourmaline rich in iron. 



Several analyses of new Swiss minerals have been lately pub- 

 lished by Herr von Fellenberg ; but, as our limits forbid any de- 

 tailed notice, it must suffice to say that they relate to a new felspar, 

 at first mistaken for a green talc; to a peculiar serpentine, con- 

 taining only a small proportion of water ; and to a variety of calcite, 

 characterized by the presence of carbonate of strontia.J 



Mining. 



The Mineral Statistics of the United Kingdom, which have just 

 been issued from the ' Mining Eecord ' office, make us acquainted 

 with the present state of our mining industries. We shall endea- 

 vour to present, as concisely as possible, the condition of last year 

 as compared with the preceding : — 



In 1865 we produced — of In 1866 we produced 



Tons. Tons. 



Coals 98,150,587 .. 101,630,543 



Iron ore 9,910,045 .. 9,665,042 



Tin „ 15,686 .. 15,080 



Copper ore 198,298 .. 180,378 



Lead » 90'451 .. 91,047 



Zinc „ 17,842 .. 12,779 



Pyrites „ 114,195 .. 135,402 



Gold Quartz .... 4,282 .. 2,927 



* Leonhard und Geinitz's Neues Jahrbuch. 1867. Heft IV., p. 457. 



f May, 1867, p. 407. 



X ' Journal fur Praktische Chcmie,' 1867, No. 9 p. 32. 



