Intelligence and Miscellaneous Articles. 69 



tains , M. Hermann has submitted to analysis some tine specimens 

 of this mineral from them. 



The method of analysis which he adopted was the following : — he 

 reduced the mineral to fine powder, calcined it to determine the 

 water, and fused the residue with four times its weight of soda at a 

 red heat ; it was then treated with boiling water, and the remaining 

 oxide of copper was weighed after heating to redness. The phos- 

 phoric acid was afterwards ascertained by deficiency, after having 

 ascertained the absence of the oxides of iron and manganese in the 

 oxide of copper, as well as of alumina and manganic acid in the alka- 

 line solution. 



The Ubethenite of Tagilsk yielded 65 '89 oxide of copper, 28' 61 

 phosphoric acid, 5"50 water. These results differ a little from those 

 obtained by M. Kiihn, — 66'94 oxide of copper, 29'44 phosphoric 

 acid, 4-01 water; and also from those of Berthier, — 63-9 oxide of 

 copper, 28' 7 phosphoric acid, and 7 '4 water. 



Dihydrite (prismatic phosphate of copper) yielded 68" 2 oxide of 

 cojjper, 25 3 phosphoric acid, 6' 28-6" 69 water. Arfwedson ob- 

 tained nearly the same results with a phosphate from Rheinbreiten- 

 bach. 



The phosphorocalcite is the most widely diffused of the phosphates 

 of copper. M. Hermann analysed three specimens of it : 



Taailsk Taeilsk Virneberg, near 



°^ ■ ° ' Rheinbreitenbach. 



Oxide of copper 68-75 .... 67-73 .... 67-25 



Phosphoric acid 23-75 .... 23-47 24-55 



Water 7-50 .... 8-80 8-20 



100-00 10000 100-00 



Except that the water is in rather larger quantity, this phosphate 

 has the same composition as the dihydrite. 



The analyses of Klaproth, Kiihn and Lunn differ much from those 

 of M. Hermann ; it would appear that Lunn analysed a different 

 mineral. 



Under the name of ehlite another phosphate of copper has been 

 described; it is found atEhl, near Rheinbreitenbach. M.Hermann 

 found a specimen from Tagilsk to consist of oxide of copper 66-86, 

 phosphoric acid 23-14, water 10-00; he describes, under the name 

 of tagilithe, an earthy phosphate of copper found at Tagilsk, on hy- 

 drate of iron, in the form of mammillated or spongy deposits. Its 

 specific gravity is about 3-50. It dissolves in acids without giving 

 out any gas. 



The trombolite is another phosphate of copper found at Tagilsk ; 

 it has already been described by M. Plattner; it is remarkable for 

 its conchoidal fracture ; it was found to consist of 39-2 oxide of 

 copper, 41-0 phosphoric acid, 16-8 water. M. Hermann has disco- 

 vered the phenakite in granite to the west of Lake Ilmen, at some 

 versts from Miask, accompanied with topaze and bluish stilbite. — 

 Ibid. Nov. 1846. 



