Scientific Intelligence , — Mineralogy, 417 



3.374 ; oxide of iron 10.266 ; oxide of manganese 0.397 ; animo- 

 niacal water 0.49? = 101.306. 



11. Bucklandite or Black Epidote. — Some years ago Mr Witham 

 of Lartington discovered in the porphyry of Glencoe a beautiful car- 

 mine red transparent variety of epidote (Withamite of some authors) ; 

 and more lately a velvet black opaque variety, named BuckhnditOy has 

 been met with at the iron-mines of Arendal, also aggregated with 

 ryakolite, among the volcanic masses of the Laacher See, and im- 

 bedded in the granite of Werchoturgi in the Urals. 



12. Chrysohcryl of the Urals. — The same mica-slate which affords 

 the beautiful crystals of Emerald and the Phenakite has lately been 

 found to contain crystals and groups of crystals of chrysoberyl of 

 considerable size, sometimes upwards of two inches in length. Gus- 

 tav Rose found the crystals to have a grass-green colour, to bo only 

 translucent, and traversed by rents ; so that they could not be used 

 in jewellery. They are dichroitic : the specific gravity = 3.689, 

 which is less than that given by Mohs, which = 3.754 ; the differ- 

 ence probably depends on the small cavities in the Uralian chryso- 

 beryls. 



13 Discovery of considerable Veins of Strontianite in Westphalia, 

 — Very lately veins of this interesting, but comparatively rare mine- 

 ral, have been discovered near to Hamm in Westphalia. The veins, 

 which traverse rocks of the chalk series, are from one inch to two 

 feet in breadth, but their other dimensions have not been ascertained. 

 Its colour is white. It occurs in granular distinct concretions, from 

 two to three inches in diameter ; and these again are composed of 

 scopiformly disposed prismatic concretions. OrystaUized varieties 

 are also met with. According to Professor Becks, it affords, on 

 analysis, in 100 parts, 94.700 carbonate of strontia, 5.220 carbo- 

 nate of lime, and a trace of iron and water. The carbonate of lime 

 appears to be mechanically mixed. It is collected in hundreds of 

 pounds, and hence these veins promise to yield strontianite in such 

 quantity as render them important in an economical point of view. 



14. EtLxenitCy a new Mineral Species. — The only known locality 

 of this mineral is near to Jolster in northern Bergenhuus-amt in 

 Norway. It was sent by Professor Keilhau to M. Th. Scheerer, 

 from whose account of it in Poggendorf's Annalen. No. 5, 1840, 

 p. 149, &;c., we extract the following pailiculars : — Description. 

 Colour brownish-black ; lustre metallo-resinous ; fracture imperfect 

 conchoidal. In thin splinters it is translucent and reddish- brown, 

 and, when pounded, exhibits the same colour, but in a feebler degree. 

 Its specific gravity is equal to 4.60. It exhibits no traces of cleav- 

 age or crystallization. The above characters shew its close resem- 

 blance to thorite, but it is harder than that mineral, and distinctly 

 scratches it. On careful analysis, the following result was obtained : 

 — Tantalic acid, 49.66 ; titanic acid, 7.94 ; yttria, 25.09 ; oxide of 

 uranium, 6.34; oxide of cerium, 2.18; oxide of Iftnthan, 0.00; 

 lime, 2.47 ; magnuMa, ss 0.29 ; >vRter, 3.^7 a 98.90. It Uuiiintd 



