Nagy et al. : Environment of Orgueil Meteorite Parent Body 541 



a light coating of carbon evaporated under vacuum for stabilization and for 

 improved heat conductance under the electron beam. Some specimens were 

 shadowed with platinum. 



Figure 1. Electron micrograph of the Orgueil meteorite. A, micaceous particle. Ao, 

 micaceous particle with one edge rolled up; B, aggregate of micaceous particles; C", opaque, 

 equidimensional particle (probably magnetite). 



In FIGURE 1 is shown 1 of the electron micrographs. It was found that the 

 Orgueil meteorite consisted mainly of thin, sheethke particles, and of the 

 aggregates of such particles. The flaky crystals had irregular shapes. Their 

 average particle size was appro.ximately 0.1 to 0.2 fx. The thickness of the 

 flakes was not estimated; it appeared that they were quite thin. Some of the 

 flakes showed a tendency of rolling up along one or more edges under the elec- 

 tron beam. The flaky particles resembled layer lattice silicates, and particu- 

 larly the thin, irregular, and fluffy flakes of montmorillonite clay. In addition 



