LANG 
sval 
3 4 
MaE 
gl. ÅA en hö FARS Ta 9 SE TEA IT SR NA 
LTU An FN CI 4 JR NE DEG 
» Se he OS TN 
3 . Bye G - 
SACN:o 1) Igneous Rocks of Sviatoy Noss in Transbaikalia. 57 
« apparently these are far less constant in their composition 
than are the andradites from the skarn-rocks and we find 
the garnet from the sviatonossite to be more closely related 
to the latter. The most striking difference lies in the percen- 
tage of TiO, which is, in the andradites of magmatic origin, 
usually high. In the andradite from the sviatonossite it 
only exceeds slightly the proportion of this oxide in the skarn- 
- andradites, and the same may be said of the garnet from the 
- nephelite-syenite from Dungannon, Canada. Moreover, if 
we take into consideration that the garnet from the sviato- 
- nossite contains many inclusions of titanite which could not 
be wholly removed, it seems probable that this garnet may 
be identical with the skarn-andradites as regards the tita- 
- nium content. 
S. J. Shand has given sufficient evidence for the opinion 
that the titanite enclosed in andradite may have been formed 
as the first alteration-product of an original titaniferous 
garnet 1). This may in part be the case with the andradite 
from the sviatonossites. The anhedral inclusions of titanite 
in the andradite most probably are such secondary products, 
while the euhedral crystals, in part enclosed in the andradite 
as they are, must be regarded as primary constituents. But 
even if we could assume that all the titanium dioxide entering 
into the enclosed titanite should have originally entered into 
the andradite, this would be evidence that the andradite 
nevertheless has been poorer in titanium than the garnets of 
most other igneous rocks. 
The composition of the calcium-ferri-garnets resulting 
from magmatic crystallization probably is dependent, besides, 
upon the composition of the magma, on the temperature 
and pressure conditions and still perhaps on the presence 
of mineralizers, whose effect may be a lowering of the 
— temperature of crystallization. Schorlomites and other 
garnets containing very much titanium are found in lacco- 
 lithic eruptive-masses' whose consolidation probably was due 
3) S. J. Shand, >»On Borolanite and its Associates in Assynt», Transact. 
Edinburgh Geological Society, Vol. IX, p. 205 (1909). 
