PLATE III. 



Fig. 1. Peridotite, — Lherzolite. Pultusk, Poland. 



Pages 



This shows a portion of a section with two chondri at the base of the figure, wliile the remaining 

 upper portion is made up of an aggregate of chondri, olivine, enstatite, diallage, pyrrhotite, 

 and iron grains. The larger and darker chondius is composed of aggregately polarizing 

 fibrous enstatitic material. This chondrus shows rounded indentations, and on its left is 

 another form, composed of alternating colorless enstatite ribs and bands of gray base with 

 minute iron granules. The dark portions of the figure represent the iron and pyrrhotite, and 

 the yellowish-brown the ferruginous staining 94, 95 



Fig. 2. Peridotite, — Lherzolite. Pultusk, Poland. 



This displays the structure of a chondrus composed of olivine, enstatite, iron, etc., cemented by a 

 gray base. This chondrus occupies the chief portion of the figure, but towards the bottom its 

 gradual passage into the groundmass is shown. The ferruginous materials are colored as 

 in Fig. 1 



94, 95 



Fig. 3. Peridotite, — Lherzolite. Pultusk, Poland. 



The brownish-black central portion is pyrrhotite surrounding a steel-gray pear-shaped mass of 

 metallic iron. Surroimding the pyrrhotite is the chondritic groundmass of the meteorite, 

 partially stained yellowisb-brown 94, 95 



Fig. 4. Peridotite, — Saxonite. Waconda, Kansas. 



This shows a mixed granular groundmass of olivine, enstatite, iron, and pyrrhotite, which is 



more or less stained a yellowish- and reddish-brown from the oxidation of the iron 93, 94 



Fig. 5. Peridotite, — Lherzolite. Estherville, Emmet Co., Iowa. 



This shows a grayish and a greenish-yellow groundmass of olivine, enstatite, and diallage, with 



dark-colored iron and pyrrhotite, surrounding a larger crystal of diallage 97-101 



Fig. 6. Peridotite, — Lherzolite. Estherville, Emmet Co., Iowa. 



This represents a semi-sponge-like mass of iron and pyrrhotite with enclosed grains of olivine, 

 diallage, and enstatite. On the left is figured a crystal of enstatite with its inclusions and 

 characteristic cleavage ; while on the right is a crystal of diallage showing its cleavages. 

 The yellowish-brown ferruginous staining is to be seen in some portions of the figure. , . . 97-101 



