40 
IOWA ACADEMY OF SCIENCE Voi,. XXVIII, 1921 
(5. Specimen from Lancaster County, Pennsylvania. — The pure 
white rhombohedral crystals are a fairly typical dolomite. 
specific gravity is 2.31. 
SiO^ 
FeA 
AlA------ 
CaCO, 
MgC 63 .... 
PER CENT 
. 0.48 
. 1.58 
. 1.63 
. 56.60 
. 40.50 
The 
100.79 
7 . Specimen from Diemhachkogel, Styria, Austria. — It is a 
typical dolomite, with large white rhombohedral crystals, having 
a specific gravity of 2.89. 
SiO, •, 
FeA 
AlA 
CaCOj 
MgCO, 
PER CENT 
. 0.40 
. 1.52 
. 0.00 
. 54.39 
. 43.51 
99.81 
8. A dolomitic limestone from Kasota, Minnesota. — The spe- 
cimen is massive, gray, soft and porous, with a reddish coloration 
on the surface. The specific gravity is 2.61. 
SA 
PER CENT 
9.41 
AlA 
1.74 
FeA 
0.96 
CaCOg 
53.67 
MgC 03 
34.82 
100.60 
p. Specimen from St. Louis, Missouri.— The rhombohedral 
crystals are on the surface of a light gray compact, massive rock ; 
they contain an admixture of silica. The specific gravity is 2.52. 
SiO, 
PER CENT 
25.70 
FeA 
0.00 
AlA 
24.65 
CaC03 
47.34 
MgC03 
2.98 
100.67 
10 . Specimen from Orange County, New Y ork.—Ymk and 
white rhombohedral crystals with a specific gravity of 2.74. 
PER CENT 
SiO^ 2.59 
FeA 0.57 
