428 Scientific Intelligence. 
closely resembles in its physical and chemical characters the saussurite or 
jade of Monte Rosa, of which it has the density (3°34, Damour). It isa 
silicate of alumina, lime and soda, and gives the same empirical chemical 
formula as dipyre. We may then expect to find between saussurite and 
this new species, to which Mr. Damour gives the name of jadeite, other 
jades having formulas which will correspond with the wernerites interme- 
diate between meionite and dipyre. Mr. Damour has just enriched the 
science of mineralogy with a new species, which from the considerations 
above given assumes a high importance. By its hardness, its specific 
gravity, and its indifference to acids, jadeite is completely separated from 
the wernerite group, and takes its place along side of zoisite or saussurite, 
with the garnets, idocrase and epidotes. The following table will serve 
to show the relations of the new species: 
Density, about - . - ; 5) 
pau Use 1) - -  Meionite. Saussurite. 
Ratio. 65271) c°- - -  Dipyre. adeite.” 
To the above translation we add from the original paper of Mr. Damour, 
already cited, the following details. The new mineral, which is brought 
from China in the form of carved ornaments, has a fine green color, like 
that of chrysoprase, bordering on an emerald-green. It is somewhat 
translucent, with a scaly fracture, and a texture which is finely lamellar 
and occasionally somewhat fibrous. Its hardness is between that of ortho- 
‘clase and that of quartz. Before the blowpipe it fuses readily into a 
transparent blebby glass. Its analysis by Damour gave 
Sili Be ox 
ca, - - ~ - - - = = 59°17 
Alumina, as sf er: - - - - 7 ait * 22°58 
Soda, andatraceof potash, - - - - - ee 
Lime, ih eae een glee eee y howe) oe eas et 2°68 
Magnesia, - oe . - cone eS ee 1-15 
sromnyd of iron, 6 OS ee ee 1°56 
~ 100-07 
important observation recently made by Des Cloizeaux, that jadeite 
presents two axes of polarization. This species, unlike the saussurite, 1s 
not attacked by acids after fusion, a fact which is to be ascribed to the 
3. Geological Survey of Canada,—Report of progress from its com- 
mencement to 1863 ; illustrated by 498 wood cuts in the text, and accom- 
geology by Sir Wm. E. Logan, 
eee al by Mr: E. Billings, and 
rof. T. Sterry Hunt. As 
