266 Progress in Science. [April, 



copper from Chili, containing Cu 2 Cl 2 , which on exposure to the atmosphere 

 readily becomes encrusted with atacamite; and it is suggested that most 

 if not all the atacamite is probably formed from Nantokite. Winklerite is the 

 name given by Breithaupt to a new Spanish mineral, of which large quantities 

 are said to have been sold in England as cobalt-ore. From an analysis by Dr. 

 C. Winkler the following unattractive formula has been deduced : — 



8( 5 Co0.2C0 2 +4H 2 0) +6(Co 2 3 .H 2 0) + 8(2CuO.C0 2 + H 2 0) + 

 + 4(2CaO.As 2 5 + 6H 2 OJ. 



A new mineral-species has been described by Dr. Lasaulx, under the name 

 of Ardennite. It is a brown or pale yellow mineral, occurring in fibrous 

 masses without distinct crystalline form. Analysis shows it to be a silicate 

 of alumina and manganese, with small quantities of magnesia, lime, and ferric 

 oxide; but what is especially notable is the presence of 6*17 per cent of 

 vanadic acid. The mineral comes from Ottrez, in the Belgian Ardennes — 

 whence the name. 



Ardennite seems to be the same mineral which M. Pisani has lately 

 described under the name of Dewalquite, but his analysis gives only r8 per 

 cent of vanadic acid. 



The rare Scotch mineral described by Brooke, in 1820, as Lanarkite, has 

 been recently studied by Pisani. According to Brooke, it is a sulphato- 

 carbonate of lead, partially soluble with effervescence in nitric acid, and leaving 

 a residue of sulphate of lead. Unable to observe this behaviour, Pisani has 

 been led to analyse a typical specimen of Lanarkite from Leadhills, in 

 Lanarkshire. He finds no carbonate of lead, though upwards of 7 per cent 

 of carbonic anhydride is recorded in some of the older analyses. According 

 to Pisani, the mineral known in most collections as Lanarkite is merely a basic 

 carbonate of lead. 



We owe to the same energetic mineralogist a recent analysis of the mineral 

 termed by M. Adam Arite. This is an amorphous substance, resembling 

 nickeline, and found in a vein in Mont Ar, at the foot of the Pic de Ger, in the 

 Basses-Pyrenees. The analysis leads to the formula Ni 2 (Sb,As), and there- 

 fore shows that Arite is not a distinct species, but is merely an arsenical 

 variety of the mineral long known as Breithauptite. 



M. Pisani has also published an analysis of the New Jersey mineral 

 Jeffersonite, from which it appears that this species belongs to the group of 

 pyroxenes. 



The third part of Dr. Carl Klein's " Mineralogische Mittheilungen " has 

 been published, but is a purely crystallographic memoir, descriptive of the 

 zinc-blende and anatase of the Binnenthal, in Switzerland. 



It is worth recording that Dr. Kenngott has found, in a specimen of basalt 

 from Landeck, in Silesia, some curious enclosures of quartz. 



M. Daubree has presented to the French Academy of Sciences a note, by 

 Mr. L. Smith, describing the mass of meteoric iron which fell, in 1862, at 

 Victoria West, Cape Colony. The iron yielded on analysis — Iron; 88*83 5 

 nickel, io - i4; cobalt, 0^53; phosphorus, o - 28 ; and small quantities of copper. 



The same communication contains some remarks on the mineral Enstatite, 

 a silicate of magnesia originally described by Prof. Shepard as Chladnite. 



Some researches, by M. Pisani, on the native amalgams of silver occurring 

 at Kongsberg, in Norway, show that two distinct amalgams are found, — the 

 one containing Ag6Hg, and therefore identical with Arquerite ; and the other 

 containing only 4-9 per cent of mercury, corresponding to the formula 

 AgisHg. Should the latter prove to be a definite species it is to be called 

 Kongsbergite. 



A paper " On the Composition of some Zeolites " has been read before the 

 Glasgow Philosophical Society, by Mr. J. Wallace Young. The paper con- 

 tains analyses of Scotch specimens of analcime, thomsonite, natrolite, and 

 stilbite, — the alkalies in which have been determined by Lawrence Smith's 

 method. 



