346 T. S. Hunt on Euphotide and Saussurite. 
various epidotes give from two to six per cent of magnesia, and 
o more than two per cent of soda.*—(See Dana's 
Mineralogy, 4th Ed., ii, 407). 
6. The composition of zoisite as already noticed by Rammels- 
berg is identical with that of meionite, a species which is shown 
by its hardness of 6:0 and its density of 2°6—2°7, to belong to 
the dimetric division of the feldspar group, where it is to the 
scapolites what anorthite (with the ratios 1: 3: 4,) is to the tn 
clinic feldspars. The mineral described by Boulanger as saus- 
surite from Mt. Genévre, with a density of 2°65, gives acco 
to his analysis (111) the oxygen ratios 7-37: 14:18: 28°75=1: 
1:91 : 2-22, and appearsto have been meionite. In de Saussure’ 
analysis, (11) if we regard the iron as\protoxyd, we obtain the 
ratios 5-22 : 14:02 : 23°50, but there is then a deficiency of 400 
p..c. in the analysis of an anhydrous mineral. Klaproth’s 1 
sults (I) seem to indicate a mixture of a silicate like pyroxene of 
talc as in vil, while the anomalous softness of v and the facility 
with which it is decomposed by acids, render it difficult to form 
Orezza, as it is also named, (the corsilite of Pinkerton, tide, 
ii, 78), which is regarded by d’Halloy as the typical ewphoti 
is not distinct from that of Mt. Rose. Delesse found the specific 
gravity of the Corsican euphotide to be only 3°10. Th 
for ; 
t, SiO, Ma: 
ugh at the time rejected, is now unive’ 
Dana has adopted it in the 4th Ed. of his Mineralogy; egcioncetiee eves 
id = 
ayde wi oxy 
epidotes the variations in the o ratios of the protoxyds, sesqu 
are about 1: 2:3, which tay te Wake’ upon se the normal ratio ioe 
1:1:2 is for garnet, and 3: 2:5, for idocrase—(This Jour., [2,] =*% 
