258 ANALYSIS OV APLOME* 



XV. 



Analysis of the Aplome: by Mr. Laugier*» 



Found on the IVJLR. Haiiy has given the name of aplome to a stony 



Lena. substance found in Siberia on the banks of the Lena. We 



are indebted for a knowledge of the place whence it is brought 



to Mr. Weiss, who has parted with his collection to govern- 



Has some re- ment. The aplome has some resemblance to the garnet and 



*emhlance to ^{^g jjocrase, or brown hyacinth of volcanoes. It differs from 



garnet and ido- 



crase. the former in its specific gravity, which is 3*444, though it 



crystallizes like the dodecaedral garnet; and from the latter 

 in its primitive form. The figure of the crystals of the aplome 

 seems to indicate, that they are the result of a decrement by 

 a single row on each edge of a cube. " This decrement," 

 says Mr. Haiiy, " is so simple and elementary, that I had 

 selected it for the first in explainifig my theory of the struc- 

 ture of crystals." This induced him to give it the name of 

 aplomey or simplicity. 

 Loss by calci- The aplome loses by calcination two per cent. A hundred 

 Treated with parts of aplome reduced to fine powder were treated with 

 potashandmu- four hundred of caustic potash. A red heat kept up for 

 half an hour produced only a pasty fusion. The mass when 

 cold was of a bottle green colour. The muriatic acid com- 

 pletely dissolved it. This solution, treated in the usual way, 

 gave for every hundred parts of alumine 



It* component Silex 40 



^ * Alumine • 20 



Lime 14*5 



Oxide of iron ,......»» 14-5 



Oxide of manganese 2 



A mixture of silex and iron • • 2 

 Loss by calcination 2 



95 

 Loss 5 



100. 



* Journal de Physique, vol, LXVII, p. 392. Abridged from the An- 

 3ales de Musee. 



This 



