196 BASALT. 



Jonsac, France. 



Tlie Jonzac meteorite is stated liy Tscliermak to have a fragmental structure, and 

 under the microscope is seen to he composed of lamellfe of anorthite and cohimus of 

 augite. Tiie former has distinct hounding lines, wliile tliose of the augite are indistinct. 

 Lying between these crystals are small grains of the same minerals, filling the interspaces. 

 The anorthite is often cloudy from minute brown glass inclusions, and black grains arran- 

 ged parallel to the length of the crystal. The augite when clear has a greenish-brown 

 color, but it is often traversed hj fissures, and rich in violet-blue, and brown, dust-like 

 particles, — chromite and pyrrhotite, possibly. The meteorite further contains pyrrhotite, 

 chromite, and iron.* 



Petersburg, Lincoln Co., Tennessee. 



The retcrsburg meteorite is, according to Professor Shepard, of an " ash-gray color, with 

 a .slight intermixture of pearl-gray, for the basis of the stone." Porpliyritically inclo.sed 

 in this groundmass are crystals and grains, which, from Shepard's and Smith's descrip- 

 tions, appear to be augite, plagioclase, and olivine. Some chromite and a garnet were 

 reported, t 



Tschermak states tliat it is composed of anorthite, augite, and a yellowish silicate like 

 olivine.^ 



The specimen in the Harvard College Cabinet macroscopically closely resembles the 

 Stannern meteorite. 



FranJcfort, Franlclia Co., Alabama. 



The Prankfort meteoric stone, according to Professor Brush, presented a gray ground- 

 mass with a pseudo-porpliyritic structure, having black, green, white, and dark-gray spots 

 on it. Professor Brush determined tlie minerals as follows : tlie black one as chromite ; 

 the white as anorthite or chladnite (it is more probably feldspar than enstatite) ; the 

 green and gray as olivine (probably some augite also) ; and, in addition, a little uickel- 

 iferous iron, and pyrrhotite (troilite). Tliis rock seems to be a basalt, to which its chemical 

 analysis refers it.§ 



Vakiety. — Gabbro. 



LiiotolaJcs, Finland, Russia. 



The meteorite from Tuotolaks was found b,y Professor F. J. Wiik to be composed of 

 metallic iron ; colorless anorthite ; gray i.sb-violet augite, inclosing long black microlites ; and 

 olivine, witli little irregular cavities. || He refers tliis meteorite to the basic eruptives. 



Tscliermak describes it as a tufaceous mass, which, in an earthy, friable, gray ground- 

 mass, holds splinters and grains of greenish, whitish, and dark color, as \vell as basaltic 

 (eucritic) fragments. He looks upon it as a volcanic ash. It contains, according to him, 

 anorthite holding little rounded glass inclusions ; augite in brownish grains, with black 

 needle-formed inclusions ; bronzite in very pale, greeuisli splinters, almost free from 

 inclusions; olivine, chromite, pyrrhotite, and iron.^ 



* Miu. Mitth., 187i, pp. 108, 109. 



f Am. Joiir. Sci., 1837 (2), xxiv. 134-137; Safford's Geo!. Reconn. of Tenn., 1S56, pp. 125-127; 

 Geol. of Tenn., 1869, pp. 520, 521. 



X Mhi. Mitth., 1874, p. 170. § Am. Jour. Sci., 1869 (2), xlviii. 240-214. 



II Neues Jahr. Mln., 1S83, i. 384; Ofversigt Fiaska Vet. Soc. Forlu, 1882, xxiv. 63, 64. 

 <]" Die mikros. Besch. der Metcorileu, 1883, i. 7, 8. 



