PLATE II. 



Fig. 1. Pallasite, — Cumberlandite. Iron Mine Hill, Cumberland, Rhode Island. 



Pages 

 This figure illustrates a more highly luaguiiied iiitennediate stage in the same rock-mass, lying 

 between that presented in Figs. 5 and G of Plate I. The dark jjortion represents the mag- 

 netite sponge which holds the lighter silicates. The brownish portion represents the smoky, 

 fissured, somewhat altered olivine, which is surrounded by a grayish and white actinolite, 

 produced by the alteration of the olivine on its borders. The ragged character of the mag- 

 netite borders, as shown in the figure, also indicates that it is associated in the change, or 

 affected by the alteration 77, 78 



Fig. 2. Pallasite, — Cumberlandite, Taberg, Sweden. . 



This shows the same general structure of magnetite enclosing silicates, principally olivine, as 

 the three preceding figures. The reddish-brown spots at the bottom of the figure represent a 

 secondary mica (biotite) produced in connection with the magnetite 81 



Fig. 3. Pallasite, — Cumberlandite. Taberg, Sweden. 



This figure represents a more highly altered portion of the same section as that shown in Fig. 3. 

 The magnetite is less in amount, having been partially removed, and the reddish-brown 

 biotite more abundant, while the silicate portions are more altered. 81 



Fig. 4. Peridotite, — Saxonite. Iowa County, Iowa. 



The grayish and brownish parts represent the granular groundmass of olivine and enstatite 

 sprinkled with ferruginous particles and enclosing the steel-gray masses of metallic iron. 

 The orange-brown represents the ferruginous staining. A little to the right of the centre 

 of the figure is represented an olivine chondrus composed of the colorless olivine grains held 

 in a grayish base 86-88 



Fig. 5. Peridotite, — Saxonite. Iowa County, Iowa. 



This represents one of the larger chondri, composed of olivine and enstatite, which blends at the 

 lower portion of the figure with the general groundmass. The enstatite and olivine grains 

 are held in a gray base, which is here given too dark a shade. The metallic iron and the 

 ferruginous staining are represented by the steel-gray and orange-brown colors 86-88 



Fig. 6. Peridotite, — Saxonite. Knyahinya, Hungary. 



This shows a granular groundmass of chondri and olivine and enstatite grains, partially stained 

 by ferruginous material to an orange- and j^ellowish -brown. One chondrus is shown extend- 

 ing from the centre towards the right of the figure, which consists of a fan-shaped mass of 

 grayish fibrous base, held in and cut by enstatite bars. At the base is shown a portion 

 of another chondrus composed of radiating bands of enstatite and base. Towards the bottom 

 of the figure, and at the left of the centre, is shown an elongated fissured enstatite crystal. The 

 metallic iron grains are indicated as before 88-91 



