74 THE SIDEEOLITES AND PALLASITES. 



Newton Co., Arkansas. 



A coarsely reticulated or sponge-like mass of iron, containing in its cells olivine and 

 enstatite (?) Chroniite and pyrrliotite also occur. 



The enstatite is of a greenish-gray color, and more or less stained by the iron. The 

 olivine is in part colorless and in part stained yellow by the iron oxide. The analysis 

 does not afford data to give the composition of the rock as a whole.* The specimens 

 seen indicate that it is closely allied to the peridotites, but probably belongs with the 

 pallasites, with which it is here placed. 



3Ie>/cUoncs, Atacama, Bolivia. 



A specimen in the Harvard Mineralogical Cabinet from Meyellones, Atacama, Bolivia., 

 shows the iron in irregular fine semi-sponge-like masses. Occasionally, it is aggregated 

 into grains from one to three quarters of an inch in length, but in general the grains are 

 minute. The iron everywhere is rough, prong'ed, and jagged. The silicates cannot be 

 distinguished from one another, except in the case of a few rounded olivine grains. 

 Tliis, with the Hainliolz pallasite, lies near the peridotites bearing iron, but does not 

 seem sufficiently distinct to be placed in a different species from the pallasites. 



Hainhoh, Westphalia. 



The Hainholz, Westphalia, pallasite, while much finer grained, possesses a structure 

 similar to those portions of the Rittersgrlin pallasite that contain the least iron, and this 

 iron in detached masses. The former contams irregular grains and semi-spongiform 

 masses of iron and pyrrliotite, while the silicates form irregular masses, partly included 

 in the iron and partly surrounding it. The silicates apparently predominate, and show 

 characters much like those of the Rittersgrtin pallasite. So far as can be told from a 

 macroscopic study of this specimen, it lies near the Eittersgriin meteorite, but forms a 

 connecting link between it and the peridotic meteorites containing iron, like those from 

 Mezo-Madras, Cabarras, Iowa Co., etc. The chemical analysis, if it is a fair index of the 

 general composition of this meteorite, would carry it into the peridotites. This pallas- 

 ite has been studied microscopically by Tschermak, who states that its included silicates 

 are olivine and bronzite, with subordinate amounts plagioclase, augite, and a cordierite- 

 like mineral The olivine grams are from 30 to 40 cm. in length, and contahi only few 

 inclusions. The bronzite grains are smaller, and contain inclusions of brown glass and 

 black grauis. The plagioclase shows the usual twinned structure in polarized light, and 

 contains grains of olivine and bronzite. A few grains of augite occur, having fine dust- 

 like inclusions, as well as brown glass globules, and angular black grains. Only two 

 grains of the supposed cordierite were seen. All the larger crystals lie in a groundmass, 

 composed of the same minerals, with a little mterstitial brown glass.f 



Lodran, India. 



The meteorite from Lodi'an, India, is descrilied by Tschermak as a granular mixture 

 of vitreous, bluish-gray, and 3'ello\vish-green grains, between which steel-gray and yel- 



* J. Lawrence Siiiilli, Miiicrulogy and Chemistry, Louisville, Ky., 187'5, pp. 339-3i-2. 

 t Sitz. Wieu. Akad., 1SS3, Ixxxviii. 349-35 L 



