I 



MINEEALOGY. 237 



Analysis of gehlenito from Orawicza in the Banat. The mineral 

 occurs in nodules with a dark-green nucleus : vesuvian is disseminated 

 through the mass ; and samoite forms an external crust. F. W. 11. 



Jexks, Col. C. W. Note on the occurrence of Sapphires and Eubies 



in situ with Corundum, at the Culsagce Corundum- mine, Macon 



County, North Carolina. Quart. Journ. Geol. Soc. vol. xxx. 



pp. 303-306. 



Describes the occurrence of corundum at this mine. Corundum Hill 



is a boss of serpentine protruded through granite. The veins dip about 



45° S.E., and consist mainly of chlorite, jefferisite, and corundum. The 



corundum is in many parts finely coloured and translucent, so as to form 



sapphire and ruby. This is the first recorded occurrence of such gems 



in place. F.W.K. 



John, K. Magnesiaglimmer vom Baikalsee. Min. Mitt. Heft iii. 



p. 242. 

 Analysis of a magnesia-mica from Lake Baikal. 



. Griinerde von Perimov in Bohmen. Min. Mitt. Heft iii. 



p. 243. 

 Analysis of green earth lining cavities in an amygdaloidal melaphyre 

 from Northern Bohemia. 

 . Vorkommen eines dem Wocheinit (Beauxit) iihnlichen Minerals 



in Kokorije. [Occurrence of a mineral resembling "Wocheinit 



(Beauxite) in Kokorije.] Ycrh. k.-k. geol. Kcichs. pp. 289, 290. 

 Johnson, "W. H. Note on two pieces of iron cinders from a furnace 



in which iron is heated. Mem. Lit. & Phil. Soc. Manchester, 



vol. xiv. p. 13. 

 Contain crystals of Fayalite, an iron chrysolite, a mineral found in 

 the Mourne Mountains of Ireland. 



JoLiN, S. Analys af ett mineral fran Delsbo i Holsingland. [Ana- 

 lysis of a mineral from Delsbo, in Helsingland.] Geol. foren. 

 •Stockholm Fiirhandl. bdt. i. pp. 237, 238. 



The formula arrived at is 2Al,03 4-7SiO, + 12HO. 



Jones, Prof. T. R. Flint : its Nature, Character, and adaptability 

 for Implements. Eeliquias Aquitanica), parts xiv., xv. pp. 202-205. 



Flint, in one condition or another, is found in most calcareous rocks. 

 It occurs as sheets and as nodules, generally in beds. It is homo- 

 geneous, and consists of silica, not so pure however as is the case with 

 quartz. This silica, once in solution, has been accumulated round 

 sponges &c., changing some of the surrounding chalk into its own 

 substance. Flint has yielded fit material for fashioning into tools or 

 weapons, the application of blows and pressure producing sharp flakes; 

 the substance is also capable of being dressed into definite shapes. The 

 surfaces of broken llints suffer changes from exposure and from mois- 

 ture, becoming opaque and often shining when aff'ectcd by alkaline 

 water. Concludes with a list of the chief works on the subject. 



W.W. 



