Contributions to Mineralogy. — Eyerman. 47 
MgO 34 20 31.20 
HsO 12.60 12.69 
99.10 99.48 
Amphirole: !^Ianv varieties are found, all more or less 
massive. Analyses of actinolite (a) in grayish-green striated 
crystals from the Reservoir quarry, and asbestus {h) in 
long pure white fibres from the Delaware River quarry re- 
sulted : 
a b 
SiO. 54.35 55.25 
FeO 2.27 2.18 
CaO 1343 12.66 
• MgO 28.05 30.19 
ign. 1.25 
99-35 100.28 
Serpentine : A large number of analyses have been made, 
three of which are here recorded : 
a, Pure white variety, resembling t' in association, color, 
texture and grain ; b, An altered aluminous variety, foliated ; 
both from W'illiams' Delaware quarry, and c. The socalled 
meerschaum from Aliddletown, Delaware Co. 
a b c 
G. 2.363 2.718 
SiO. 
AUO3 
FeO 
CaO 
MgO 
Na.O 
H.O 
100.66 99.26 99-11 
Of the many minerals found in the serpentine belt, as 
might be expected, the majoritv are more or less altered, and 
pseudomorphs are not uncommon. 
III. Garnet. 
In my account of the mineralogy of the French Creek 
mines (Trans. X. Y. Acad. Sci., viii, 1889) I mention 
lime-iron garnets as occurring in considerable quantities at 
shaft Xo. I. These occur in large groups of dodecahedral 
crystals with truncated edges, single crystals varying in size 
from ^ to 2t mm. ; color vcrv dark brown; fracture resinous. 
44-21 
39-83 
44-58 
2.72 
6.39 
tr 
-52 
1. 71 
2.13 
-24 
• 07 
tr 
40.55 
39-92 
I. II 
39-49 
12.42 
10.23 
12.91 
