246 h. Pumpelly—Paragenesis of Copper 
atolite, in exceedingly minute crystals, lying on_ both 
the chlorite and calcite ; they are less than 51; inck in diame- 
2. Laumontite, of which only the form now remains. 
3. A mineral, now gone, which seems necessarily to have 
been present to support the isolated crystals of quartz. — f 
4. Quartz, in minute prisms, containing brilliant particles 0 
copper. 
5. ? Calcite, represented only by impressions in the copper 
This calcite may, perhaps, be older than some of the foregomg 
members. 
see above). 
7. Chlorite? the same mineral as the 6th member of No. 18; 
and occurring in the same manner. — 
8. Calcite ; a few small sealenchedrons planted on the copp@ 
in the impressions of the older calcite = 5th above. 
No. 14a. Copper after laumontite, from the Pew asic COPPER 
i [eeiatareg who Fast f a partially filled 
€ upper face of this specimen is of a 
cavity a cupriferous _ highly iatsred amygdaloid ; es 
lower, or broken face, is a portion of the altered amygdalot 
i e general appearance of the specimen at first eee 
is that of a Sy cavity, nearly filled, except in the middle, 
with broken erystals of calcite, whose interiors contain many 
thin plates and threads of native copper. th 
The amygdaloid is a soft compact brown and rock wi 
earthy fracture—an altered amygdaloidal melaphyr. Th 
aS small amygdules near the wall of the larger cavity are of calcite. 
ey a CEST TI ie Bon et 7 Oe PE ae ee ON a ae 
