we! 
Mineralogy and Geology. 123 
abounds in nearly all. In one set of works, fragments of “ béresite” 
prevail, in another greenstone porphyry, in a third serpentine, in a 
fourth augite porphyry. ~ Iron pyrites appears in one and not in another; 
but garnets, zircons, magnetic iron ore, chromate of iron, specular and 
_ other ores of iron are with rare exceptions common to all these accumu- 
lations. The gold mines south of Miask, are among the most productive 
of the Russian mines, in the undulating grounds on the western side of 
the Miask. This. rich detritus has been carried by the diluvial current 
quite to the summit of some of the greenstone hills. In the depressions 
the greatest masses of detritus have accumulated, and are there covered 
with a thick spread of clay. In these hollows, particularly around the 
Zavod of Zarevo Alexandrofsk, the very heavy pepites or lumps ‘of 
solid gold have been found. ‘These masses have weighed respectively 
13, 14 and 24 pounds, but since Mr. Murchison’s visit, the huge lump 
weighing 78 English pounds has been found; all of these are in the 
Imperial museum at St. Petersburg. As a general thing, however, 
ns lumps of gold are an exception in the Ural. 
» Platinum, in the Urals, is now worked only within the territories of | 
the Demidoff family. Mr. Rose found gold in only one of the numer- 
ous platinum deposits which he examined, and in no instance could he 
tect any vein-stones of quartz or other fragments of rocks, or of 
magnetic iron, so abundantiin the gold alluvia. It has been found in 
grains weighing from 14 oz. to 1 1b. and rarely 2 and 3, and in one 
instance 8 Ibs. It is found in much smaller accumulations than the 
gold, but like the gold, it has been lately shown by M. Schwetzof and 
M. Le Play, that it is disseminated throughout the entire mass of certain 
crystalline rocks. He has traced up more than 20 courses of platinifer- 
ous alluvium to the common centre, the Mount La Martiane, from which 
they have been all derived, and of whose detritus they are all composed. 
This Rannoy, ee be taken asa sone fact of the —— of this 
metal. 
10. Aainite and other Minerals in a Fossiliferous rock; by M. A. 
Daubrée, (Bull. Soc. Geol., 2d. ser., i, 408.)—Axinite has been detected 
in the Vosges in a fossiliferous rock, which had been altered by contact 
with a variety of trap. The rock had been rendered hard siliceous, 
pane had lost its fissile character. It contains numerous impressions of 
opora spongites (Goldfuss,) and: Flustras ; and in these same 
7 there are nodules of lamellar calcite, and also some epidote, 
and quartz. It appears that the lime of these nodules was 
derived: ‘fro corals, and the same. contributed to the formation of the 
epidote and hornblende. Moreover, the crystallization of these min- 
erals took. place without a softening of the rock. In some cavities 
there are crystals of these minerals with others of Axinite. 
