Meteorite Collection — Handbook and Catalogue. 23 



Upon the metallic portions of the aerosiderolites the Widman- 

 statten figures can usually be brought out (Atacama 162. Roclo- 

 wood 184) and, as these are quite similar to those of the wholly metallic 

 meteorites, they indicate the existence of corresponding conditions 

 in the formation of the mass. 



Analyses of some of the aerosiderolites represented in the collec- 

 tion show the following composition : — 



(1) (2) (3) (-1) (5) 



Atacama, Krasnojarsk, Rittersgriin, Carroll Co., Hainholz, 



Chile. Siberia. Saxony, Ky. Prussia. 



(160) (157) (164) (180) (165) 



Si 2 13.60 20.43 26 -79 2 9-5 2 33-24 



Fe 60.27 44-° 2 jFe-fNi. 1 20.48 4.12 



Fe 2 3 1 50.41IJ 22>2 o 



Fe O 4.09 6.86 3.53 14.11 3.51 



Al 2 3 O.OI JMnO) 0.70 O.72 



CaO 1 0.21 f 0# 66 



MgO 15.68 23.67 6.31 31.37 30.52 



NL... 5.73 5.37 JNa 8 0) 4- 22 LOS 



Co 0.23 < °-4 8 » 0.28 



£ U j 00 , °'° 2 JP J. JCr 2 3 *FeOt 



Sn }°-°> , FeSl ' °°*< > °5° f 



H 2 O 1 7 23f 2 .86 



Insol 0.20 0.24 



99.58 101.07 96.13 100.00 98.72 



Sp. Gr.. 6.16 5.44 4.29 4.41 4.61 



From meteorites of this class ever}'- gradation can be traced to 

 the aerolites, meteorites in which the stony or siliceous matter predo- 

 minates. These usually contain scattered metallic grains, sporado- 

 siderites of Daubree (Kesen, 257, New Concord, 274, Homestead, 314), 

 but some show no metallic constituents whatever, asiderites of Dau- 

 bree (Alais, 221, Juvinas, 237). The aerolites are made up chiefly of 

 the minerals chrysolite, bronzite, augite, enstatite or some other 

 member of the pyroxene group, anorthite or other feldspar, chromite, 

 nickel-iron and troilite. These are usually crystallized and occur in 

 angular, splintery fragments, but are sometimes developed porphyriti- 



(1) Von Kobell and Rivero, Korrespondenz-BIatt Vereines Regensberg, 1851 . Recalculated by 

 M. E. Wadsworth on the supposition that the silicates constitute one-third of the mass. 



(a) J. J. Berzelius, Ann, Phys. u. Chemie 1834, Vol. 33, pp. 123—135. 



Recalculated by M. E. Wadsworth on the supposition that the silicates compose one-half of the 

 mass. 



(3) C Winkler, Nova Acta I.eop. Acad. Halle, 1878, Vol. 40, pp. 333, 282. 



(4) J. B. Mackintosh, Am. J. Sc. 3rd ser , Vol. 33, p. 282. Mar. 1887. Recalculated by ihe author 

 on the supposition that the silicates constitute three-fourths of the mass. 



(5) C Ranimelsberg, Mon. Berlin Akad., 1870, pp. 322—325. 



Other analyses may be found in the work of Wadsworth, previously cited. 



