254 MINERALOGY. 



Teibolet, M. [F.] de. Sur la Saiissurite et la Nephrite (Jadeite). 

 Pp. 12. Published with BuU. Soc. Sci. Nat. Neuchatel, t. x. 1 

 cahier. 



Regards saussurite as a product of the alteration of anorthite. Shows 

 that several distinct minerals are grouped together under the common 

 name of nephrite, and distinguishes between true nephrite and Damour's 

 jadeite ; the former is a silicate of lime and magnesia, and is probably 

 a compact variety of tremolite ; the latter contains alumina up to 23 

 per cent., and stands near zoisite ; an intermediate form occurs in 

 New Zealand. Describes the mode of occurrence of nephrite in New 

 Zealand and in the Kuenluen mountains. P. W. R. 



Teoost, Gerard. Manuscript Catalogue with minute descriptions of 

 specimens in the late Dr. Ger. Troost's Mineralogical and Geolo- 

 gical Cabinet. Amer. Journ. ser. 3, vol. viii. p. 319. 



Note announcing the existence of the above. 



TscHERMAK, G. Ludwigit, ein neues Mineral aus dem Eanate. Min. 



Mitt. Heft i. pp. 59-66. Under different title in Yerh. k.-k. 



geol. Reichs. p. 37. 



Ludwigite is a new mineral from Morawitza in the Banat. It occurs 



as a dark green or black fibrous substance, which appears to be a 



molecular combination of borate of magnesia with proto-peroxide of 



iron. P. W. R. 



. Die Porm und die Yerwandlung des Labradorits von Veres - 



patak. [Porm and alteration of Labradorite.] Min. Mitt. Heft 



iv. pp. 269-278, 9 woodcuts (crystals). 

 Describes crystals of plagioclase in the quartz -andesite of Verespatak, 

 in Transylvania. The crystals are always twinned, according to laws 

 illustrated by the figures. They become altered to a kaolin-like sub- 

 stance, which consists mainly of a potash-mica with a hydrous silicate 

 of alumina. Analyses are given of the pseudomorphs and of unaltered 

 labradorite, from which it appears that the change consists chiefly in 

 the replacement of soda by potash, the removal of lime, and the addition 

 of water. P. W. R. 



. Neue Einsendungen an das k.-k. mineralogische Hof- Museum. 



[New contributions to the Imperial Geological Museum.] Yerh. 



k.-k. geol. Reichs. pp. 86, 87. 



Describes some new materials transmitted to the Geological Museum 



of Yienna. Also gives a fuller account of Ludwigite, noticed in a 



former communication. H. A. N. 



T. [TscHERMAK ?] Eisennickclkies aus dem Sesia Thale. Min. 



Mitt. Heft iv. p. 285. 

 Describes occurrence of iron-nickel pyrites [Pentlandite] with 

 magnetic pyrites, from the Sesia Thai, in Tyrol. 



. Potash-salt from East India. Rec. Geol. Surv. Ind. vol. vii. 



