THE STRUCTURE OF METEORITES 



I8l 



mass and in the eccentric arrangement of their fibers that chondri 

 differ chiefly from the spherulites of terrestrial rocks. 



SUPERINDUCED STRUCTURES 



Several structures occur in meteorites which have apparently 

 originated subsequent to the consolidation and solidification of 



Fig. io. — Slickensided surface, Long Island meteorite. Natural size. From a 

 specimen in the Field Columbian Museum. 



the mass as a whole. These may be enumerated as ( I ) slicken- 

 sides, (2) faults, (3), bent plates, (4) veins, and (5) cleavage 

 and joints. The first three may be grouped under the head of 

 evidences of preterrestrial movement, but it should be stated 

 that some authorities regard all these structures, including veins, 

 as of terrestrial orig-in. 



