Mineralogy of Orange County, N. Y. 231 
by a fracture, and reveals a small cavity that contains crystals of Co- 
tundum. This spot has furnished a number of handsome crystals of 
bluish white Corundum, attached to loose masses of grey Hornblende. 
Locality No. 6, is one mile north of Amity church, upon land 
owned by Wm. Raynor, and situated in a wood. The Limestone 
merely crops out over an extent of a few rods, and is filled with Bru- 
cite of various colors, but mostly dull; black Spinel in hemitropes, 
and Magnetic Iron in large octahedral crystals, whose faces are 
rough ; it also contains Hornblende and blackish Serpentine. The 
aggregate is in a decomposing state, apparently from the presence of 
‘the Octahedral Iron. 
No. 13 is situated upon the land of Isaac Smith, two and a half 
miles north of Edenville. It affords handsome groups of Spinel 
crystals. To obtain them, it is necessary to dig into a side hill, and 
roll over large blocks of an aggregate consisting of Hornblende, Mica 
and Limestone, upon whose surfaces and in veins traversing them, 
Weoften find druses of large octahedral crystals, varying in size from 
a quarter to one inch in diameter. ‘Their form is well defined, the 
edges of the octahedrons being sharp and their surfaces perfectly 
flat. They are of a dark green, almost black, color; and are often 
possessed of a good degree of lustre. This place produces, occa- 
sionally, handsome crystals of Zircon, straw colored Brucite, and 
green and black crystallized Hornblende. 
No. 14 is a spot between Mt. Adam and Mt. Eve, upon the farm 
of Wm. Davis, which affords red and black Spinel, red Brucite, Au- 
gite, green Hornblende, Idocrase and Scapolite. 
No. 15 situate upon the declivity of Bellvale Mt. affords handsome 
four-sided prisms of Rutile, terminated by four-sided pyramids. They 
are about half an inch in diameter, of a brownish black color, and 
free from those strie common in the crystals of this substance. The 
gangue is a sienitic Granite, which also contains handsome crystals of 
brown Zircon and lengthened prisms of White fron Pyrites, termin- 
ated at both of their extremities by dihedral summits. ge 
The Magnetic Iron deposit, No. 16, is described as occurring in 
the blue Limestone ; but it is more probable that it belongs to the 
Primitive, which may approach the surface at this spot. A perpen- 
dicular excavation, twenty five or thirty feet in depth, was made here 
Many years ago for the purpose of working the ore ; but the limited 
quantity in which it occurred, caused the undertaking soon to be 
abandoned. The ore existed in isolated masses from the size of a 
