‘* 
greenstone rocks near Boston, two or three years since, I observed the | 
surface, where long” exposed to the weather, to 86 Boversé with scales — 
of mica, while the interior did not contain that mineral, but hornblende 
instead, papreionnr aged that the change had been wrough L by s some 
action of the atmos 
selected apeciinaldy from the ‘diferent portions of the rock and from 
several others, and on my return home one. upon them with 
the blowpipe: I found that every specimen of lende, whether 
from the outside or the interior of syenite or any ak which contained 
that mineral, when presented to the inner flame, gave the result usually 
described in the books; but weathered particles of the hornblende, in 
the outer flame, took a lighter color, and when cold, the slightest blow 
caused them to ses into gold colored scales whieh presented every 
sore Netiad of m 
4. 
vince in the Wivieess of ee It had remaine 
lately unobserved beneath a heap’ of stones before the Fie 
farmer It-has an irregular roundish figure, with many deep én 
depressions, measures about a foot in diameter, and weighs (appa 
near two hundred pounds. It is’black on the outside, though coated in 
Many spots with hydrated oxyd of iron, perfecily egies within, h 0- 
neous, and of a steel-gray color; and resembles so much in these 
points, as well as in its malleability, the meteoric iro? of Brau 
(Bohemia), that, in all probability, it possesses the same che ical 
position. Pro t. D uflos’ has already detected, in addition to the i 
presence of ier us, nickel and cobalt. It is soon to receive 
and complete analysis, Us Bae 
* 5. Carbonate of Copper i Zinc ; by Prot. A. Connett, (Jameson’s 
Jour., vol. xlv, p. 36, July 848, }— This carbonate from Matlock has — 
a_pale green he with | Watioled structure and pearly lustre; it is 
disseminated i in small portions through the matrix. Analysis afforded 
esia a 
om of oy hepa ‘copper and zinc combined with'an atom 
ana 
be ah or.2(Ca, Zn) O CO2--HO; but the sma!lness of the quant 
Pp 
vented the” seria of the relative quantities of carbonic acid — 
and water. This aye ag seems to be either identical with aurichalcite 
or nearly allied to 
6. On the Couierenes of Ores of Mercury in the Coal 1 Formation 
‘of Saarbrisck ; by Herr Von Decuen, my (Gontoeteal Journal, No. 14, 
-p. 33.)—In a lecture before the Bidinty of the Lower Rhine, Herr Von 
‘Declien notices this singular fact. “These ore S are, in sind: ‘very 
rare, and, in this place, occur in the upper division of the carboniferous 
group in beds belonging to the productive coal formation, or even to a 
er part of the series, in which previously they were’not known to 
be found in any part of the earth. In this. district they are confined to 
Its east district of St. W. 
portion ; Baumholder, in the 
at endel, being 
» most western point where they have been | ound, = Kellerberg, 
