Scientific Intelligence — Mineralogy , 381 



identity of that substance with Tremolite. — The generic name of 

 Jade has been given to several mineral substances, which, uniting 

 certain physical characters, such as hardness, tenacity, and compact 

 structure, have yet been but little studied in regard to their com- 

 position. Thus there have been distinguished the Ascian or Axi- 

 nian Jade, the Jade of Saussure, and the Nephritic or Oriental 

 Jade. The two first, judging from their aspect, would seem to be 

 compound rocks ; but the Oi'iental Jade, on account of its constant 

 homogeneous nature, and from the whole of its characters, has been 

 always regarded by mineralogists as constituting a mineral species 

 properly so called. The first analysis of that substance was by 

 Karsten, and, more recently, Rammelsberg has published a second 

 analysis, which did not at all agree with Karsten's. It seemed to 

 me that the Oriental Jade deserved to be re-examined, and I there- 

 fore undertook the analysis, of which the following is the result : — 



Silica, 



Magnesia, 



Lime, 



Oxide of Iron, 



0-9876 



Judging from its composition, its specific gravity, its hardness, and 

 its fusibility, the oriental jade approaches most nearly to tremolite ; 

 and, if this opinion should be adopted, it will be arranged in collec- 

 tions under the name of Compact Tremolite. — (Comptes Rendus^ 

 1845, 2*'«"»« Semestre, 22d Dec, p. 1382.) 



12. Predazzite. — This name has been given by Petzholdt (^Beit- 

 rdgezur Geognosie von Tyrol, p. 194) to a limestone from Predazzo, 

 in southern Tyrol, and which contains 6-98 per cent, water, in addi- 

 tion to carbonate of lime 68*7 ; carbonate of magnesia 30-3 ; silica, 

 alumina, and oxide of iron 1-0=100. It is a bitter-spar which, 

 like gurhofian and other varieties, contains 2 atoms of lime and 1 

 atom of magnesia, besides 1 atom of water, if the latter should prove 

 to be an essential constituent. — (^Rammelsberg^ s Zweites Supplement, 

 p. 117.) 



13. The so-called Red Albite of Kimito is an Oligoclase. — Chod- 

 new has analysed (in Professor Henry Rose's laboratory) the felspathic 

 mineral found at Kimito, in Finland, and termed by Nordenskiold 

 red albite ; and he has ascertained that it is an oligoclase. Its 

 specific gravity is 2-63 ; and its composition is the following : — 

 Silica, 63-80; alumina, 21-31; lime, 0-47; potash, 1-98; soda. 

 12-04 = 99-60. — (Poggendorff's Annalen, Vol. Ixi., p. 390.) 



14. Crystallized Kupferindig. — Breithaupt states {Poggendorff's 

 Annalen, Vol. Ixi., p. 674), that the Kupferindig of Leogang, in 

 the Saltzburg district, occurs crystallized in distinct hexagonal prisms. 

 He remarks, that this crystallization reminds us of the same form 



