T. S. Hunt on Euphotide and Saussurite. 337 
Mohs gives 3-256 for the density of a granular saussurite from 
Peidmont, and 3°34 for a compact variety from the Canton of 
Vaud, while Naumann assigns to the mineral a density of 3°40. 
‘These authors thus agree in ascribing to saussurite a specific 
gravity much above that of the feldspars. 
Klaproth and de Saussure junior, both analyzed specimens of 
the saussurite from the shores of the Lake of Geneva (lemanite, 
land it) while Boulanger subsequently examined the saussurite 
from the euphotide of Mt. Genévre (111), and from two localities 
eg the valley of Orezza (tv) and the banks of the Fiu- 
V). 
‘i L IL. Il. IV. v. 
ilica, 49:00 44-00 44°65 43°6 34-0 
, Alumina, 24-00 30-00 304 32-0 24-4 
Peroxyd of iron, 6°50 12°50 pais cogs ces 
Lime, 10°50 4-00 15°5 21:0 31°8 
: Te ae 25 24 64 
5°50 6-00 15 ee 
Potash, Kee 25 oe 16 cn 
99°25 96-15* 1005 1006 966 
a physical and chemical characters of the above specimens 
i considerable differences. The saussurite 11. is described 
eSaussure as leek-green, subtranslucent, with an oily lustre, 
hd s finely granular, scaly fracture; it scratched quartz and 
loss of 
at having a density of only 2°8. This saussurite, which 
han from any admixture of smaragdite, was scarcely attacked 
ir rang sulphuric acid.—(Journal des Mines, vol. xix, p. 205, 
Soe ussurite from Mt. Gendvre (11) according to Boulanger 
lated with a greenish-brown smaragdite, and is itself 
with'a 4 Sometimes chatoyant, hard, not attacked by acids, and 
Sar ge easity of 2°58. “The analysis of this undoubted feld- 
ch Cave him, silica 66-6, alumina 18°5, lime 1-8, soda 6:0, pot- 
£3 = 97-9, 
Posed oe entide of Orezza is described by Boulanger as com- 
Tiety of steen diallage, a blackish matter also apparently a va- 
ande diallage, and saussurite i 
© Saussurite (Iv) was very compact, less hard than 111, 
bye ty of 3-18. It was easil ble and not attacked 
: 4 *oncentrated sulphuric acid. x 
®conp * Besides 0°05 oxyd of manganese. 
0% Vor. XKVI, No. 81.~MAY, 1 
le 
