Mineralogy. 177 



23._ The oxides of titanium and iron Mr. Seybert regards as accidental.' 

 The chemical formula, according to the method of Berzelius, is given 

 A 4 S + 2G A 1 . Among the physical properties of the chrysoberyl from 

 Haddam are quoted a pale green colour, and a specific gravity found 

 in one specimen == 3.508, in another = 3.597. It does not present the 

 opalescence of the varieties from Brazil and Saratoga. It occurs in the 

 well-known mixture of albite, quartz, manganesian garnet, and yellow 

 granular beryl. (Silliman's Journal, vol. viii. p. 105.) 



21. Potassium and Sodium. — Mr. Frederick Butz of Nion (Canton de 

 Vaud) in Switzerland, manufactures potassium and sodium for sale, the 

 price of potassium is L.2 per ounce, that of sodium L.4 per ounce. 

 (Schweigger's Journal, x. p. 494.) 



III. NATURAL HISTOIU'. 

 MINERALOGY. 



25. Roselite, a New Mineral Species. — Form prismatic. Combination 

 observed similar to Plate III. Fig. 35. inclination of a' on a- over 



4 4 4 



P = 47° 12', of e a on e 3 over P = 45° 0', L' on V, over e 3 = 79" 15° ; 

 b' on h' over a % = 1 14° 24 ; h on h adjacent = 140° 40'; edge z on edge 



4 



z = 125° T ; h on e r < = 129° 0' Cleavage distinct and brilliant parallel 

 to P. Surface, o 2 rough, and as it were hollowed out in the middle, 

 the rest smooth. Colour deep rose-red. Translucent. Hardness = 3.0, 

 the same as calcareous spar. It was discovered by Mr. Levy in the col- 

 lection of Mr. Turner, in small well-defined crystals on amorphous 

 greyish quartz from Schneeberg in Saxony. Mr. Levy remarks that its 

 great resemblance with the arseniate of cobalt from the same locality, 

 had hitherto caused its being placed with it. It is named in honour 

 of that distinguished mineralogist, Mr. Gustavus Rose of Berlin. 

 According to Mr. Children, who examined its chemical properties, it 

 gives off water before the blowpipe in the matrass, and becomes black ; 

 with borax and salt of phosphorus in the oxidating flame upon pla- 

 tina wire, it yields an intensely deep blue glass. It gives soluble salts 

 with muriatic acid, which produce a precipitate with oxalate of ammo- 

 nia. Digested in caustic potash, evaporated, redissolved, and the 

 alkali neutralized with nitric acid, it gaye, with nitrate of silver and 

 ammonia, a brown- red precipitate of arseniate of silver ; with bicarbo- 

 nate of ammonia and phosphate of soila, it gave indications of mag- 

 nesia. It therefore contains water, oxide of cobalt, lime, arsenic acid, 

 and magnesia. 



Roselite is a very rare mineral, though from the preceding description 

 it appears that the specimen in Mr. Turner's collection is not the only 

 one described in mineralogical works. There is a specimen of it in the 

 U'unerian Collection at Freiberg, to which the ancient but not very 

 accurate description by Werner of the crystals of cobalt bloom refers, 

 that they are compressed, acute, double, si i -sided pyramids. (Jam. Sysl. 



VOL. II. NO. I. JAN. 1825. N 



