514 
GEOLOGY OK the FIRST DISTRICT. 
6. YELLOW GARNET? of Edenville. 
In the summer of 1828, I obtained at Edenville a yellowish brown crystallized mineral 
imbedded in white limestone, associated with pargasite and grey glassy tremolite. It resem¬ 
bles in external characters, and in its treatment with the blowpipe, the yellow garnet of New¬ 
ton, New-Jersey, analyzed by Mr. Seybert. Specimens from Newton and Edenville both 
melt easily before the blowpipe, swelling out much, and forming a white fritty glass. A small 
brilliant crystal, mounted on the reflective goniometer, gave the following angles : 
m on T .. 90°00' 
monb .. 141 40 to 141°48' 
mona' 138 10 to 138 20 
h on a' .. 144 04 to 144 15 
m on d} .. 160 30 to 160 34 
m on cP .. 150 00 
m on d® 146 00 
m ond' .. 146 15 
m on .. 123 12. The planes d^, d*, were not so brilliant 
as to give perfect reflections. The above angles approximate to modifications of the rhombic 
dodecahedron. Seybert’s analysis gave the following as the composition of the Newton garnet: 
Silex- 32.80 
Lime .. 27.80 
Protoxide of iron_ 27.56 
Alumina_ 3.06 
Magnesia_ 1.24 
Manganese_ 6.32 
Water_-_ 1.10 
99.88 
7. SPECULAR OXIDE OF IRON. “ TITANIFEROUS IRON.” 
This ore has been found in large detached crystals, at the locality of the large spinelles and 
of serpentine near Amity. It has been called chromate of iron by Dr. Fowler, because it 
colored nitre green ;* and specular iron {Fer oligiste) by Shepard,! and columhite. It occurs 
in a gangue of serpentine which is sometimes crystallized, and is associated with spinelles, 
brucite, calcareous spar, etc. Its specific gravity in distilled water at 47° of Fahrenheit’s 
thermometer, was 4'319. The following measurements were made with the common go¬ 
niometer : 
Fig. 32. 
h 
American Journal of Science, Vol. 9, p. 243. 
t Ibid. Vol. 21, p. 329. 
