' ~^ Scientific Intelligence — Mineralogy. 367 



disseminated grains and also in masses several pounds weight, in 

 serpentine, in vvhich it is associated with chromate of iron. Part 

 of the gold of that region occurs in quartz veins, along with 

 auriferous iron-pyrites, and grains of gold have also been de- 

 tected in the serpentine. The chlorite slate of the Urals proba- 

 bly also contains platina. 



11. HtjdroboracHe, a new mineral. — Colour white, radiated 

 and foliated, and soft like gypsum. Specific gravity = 1.9- It 

 is readily distinguished from such minerals as it might be con- 

 founded with, by its easy fusibility before the blow-pipe. Ac- 

 cording to H. Hess, it contains the following ingredients: Lime 

 13.298, magnesia 10.430, water 26.330, boracic acid 49-922 ; 

 = 100.00. 



1 2. Idocrase in the Island of Shye. Discovered hy G. B. 

 Greenough, Esq. — This mineral was found at the junction of a 

 trap dike with the calcareous rock it traverses. Its locality is 

 about a mile and a half south of Broadford, on the way to 

 Kilbride. The dike averages about four yards in width. Mr 

 Greenough could not determine its extent, from the heather, 

 8ec. which covers the surface. 



13. Chiastolite. — According to Dr G. Landgrebe of Marbourg, 

 as stated in Schweigger-Seiders Journal, H. 5. 1830, this mi- 

 neral contains, silica 68.497, alumina 30.109, magnesia 1.125, 

 water and carbon 0.269 ; = 100.00. The remarkable structure 

 of this mineral is well known ; we may add, from Weiss, that 

 many salts, as muriate of soda for example, when dissolved in 

 fatty substances, as butter, and again crystallized from them, 

 exhibit in their crystals the same structure as observed in chias- 

 tolite. 



14. Antimonial Nickel. — Our latest discovery from the ever 

 inexhaustible Andreasberg is a very interesting mineral, a com- 

 bination of nickel and antimony, resembling at first sight copper- 

 nickel ; but, having attracted the attention of a pupil of mine, 

 Mr Charles Volkmar of Brunswick, Stromeyer and self follow- 

 ed up the examination. The ore is found in minute thin hexa- 

 gonal plates, which seem to be regular, and in interspersed par- 

 ticles, on galena and speiscobalt. Fracture uneven, passing into 

 small conchoidaL The terminal planes are of a high metallic 

 lustre, the planes of fracture shining. The colour is a light cop- 



B b2 



