May, 1902. METEORITE STUDIES, I—FARRINGTON. 293 
have at my disposal four pieces, amounting in weight to 20-30 grams. 
They possess a rusty weathered surface. Many hundred similar 
pieces were found (in part with crust), having a total weight of 1,184 
pounds. The meteorite of Long Island is a compact, dark stone, 
which appears dark green on fresh fracture and shows numerous 
metallic specks. The crystalline structure is megascopically visible; 
there are numerous shining cleavage surfaces and the meteorite 
resembles the fine-grained harzburgite from Riddles, Oregon. Chondri 
are only now and then to be seen. Under the microscope it is clearly 
seen that chrysolite and bronzite are the characteristic ingredients. 
The structure as well as the relations in quantity of the two constit- 
uents are very variable, the chrysolite now being in excess and now 
again the pyroxene, and the general porphyritic structure passes com- 
monly enough over toa purely granular one. Chondrus-like forms are 
found throughout, but they are seldom developed in an especially 
characteristic way. Ragged particles of metallic iron, numerous 
grains of iron sulphide (troilite?) and chromite complete its compo- 
sition. The chrysolite occurs generally in porphyritic, more or less 
idiomorphic crystals, and in fragments. In the fresh condition it is 
colorless, but on slight heating it becomes reddish brown and 
pleochroic, and at red heat completely opaque, indicating a high con- 
tent of iron. The cleavage of the mineral is always clearly developed, 
and this shows in many cases undulatory extinction. It is very rich 
in inclusions, generally appearing as dark-brown rounded forms 
which often show regular arrangement. In the weathered portions 
there occurs beside iron hydroxide, a serpentine-like substance as an 
alteration product of the chrysolite. The orthorhombic pyroxene is 
likewise colorless and transparent and may be classed as bronzite. 
It tends to form groups of larger individuals where the stone has 
granular structure; in smaller crystals it occurs also as a constituent 
of the ground mass in the porphyritic forms. Its distribution in the 
stone can best be seen if a section is treated with hydrochloric acid. 
This dissolves out the chrysolite but leaves the pyroxene unattacked. 
In sections so treated it can especially well be seen that the bronzite 
where it occurs as a constituent of the ground mass often exhibits 
skeleton growths which lie imbedded in a colorless substance and are 
not attacked by hydrochloric acid. This has weak refraction and 
between crossed nicols shows irregular illumination so that it is not 
improbable that it is a glassy substance possessing optical anomalies 
through strains. Rarely, besides the orthorhombic pyroxene there is 
to be seen a monoclinic augite in single grains, with the properties of 
diallage. The solid iron occurs in angular particles and often in 
