152 iM. Godon’s mineralogical observations. 
It consists, most frequently, of rounded or irregular nodules, com- 
posed of quartz, felspar, laminary carbonated lime, epidote, and some. 
times chlorite talc. These substances often exist in insulated con- 
cretions ; but, sometimes, two or three are united in the same nodule. 
Some of them, consisting of quartz, appear as if enchased in the sub- 
stance of epidote ; some others present a cavity in their centre, the 
surface of which is coated with microscopic crystals of quartz and 
epidote. 
The cement, apparently homogeneous, which unites these glo- 
bules, is commonly reddish brown, sometimes verging to greenish. 
It often contains particles of a blood-red coloured substance, which 
Seems of the same nature as the jasper petrosilex (22.)}; some spots 
of carbonated copper ; and. now and then, crystals of amphibole and 
chlorite talc. Sometimes it contains veins of felspar, lamellated or 
almost compact; sometimes of quartz, accompanied by thin lamina 
f oligist iron, carbonated copper, pyritous copper in small particles, 
and chlorite talc. This rock is found contiguous to felsparoid, epi- _ 
dotic amphiboloid, and porphyritic wacke, on which it is observed 
resting [Brighton]. Sometimes it occurs with a schistous texture, 
and even emits an argillaceous smell, when breathed on. 
This rock is analogous to the toadstone of the English. When 
of great compactness, it is susceptible of a fine polish. 
Conclusion. 
I present the description of this series of rocks, which evidently be- 
longs to primordial soil, without any hypothesis on the comparative ; 
order of its formation. In the course of my observations, in this and 
other countries of America, which appear remarkably well suited for 
pee aE Rea ae 
Se te ne Nemes ee 
