Notice of a Locality of Zeolites. 71 



No. 9, on the north side of the cut, about ten or twelve feet 

 from the ground, is a spot furnishing several species. They occur 

 in veins of from half an inch to an inch in thickness, and in the 

 following manner : 



1. Analcime and natrolite. 



2. Datholite, analcime, and natrolite. 



3. Apophyllite, primary and secondary forms, stilbite, and na- 

 trolite. 



As the rock is very hard, and not to be reached without stand- 

 ing on a ladder, it was difficult to obtain even a few small speci- 

 mens. 



No. 10, on the south side, is a vein of Thomsonite, about an 

 inch thick in the best part. It is lost toward the bottom, and the 

 part from which the specimens were taken is about twelve feet 

 from the ground. 



No. 11, a few steps farther in advance, on the same side of the 

 road, at eight feet from its level, is a vein about three inches 

 thick, which gradually decreases in size towards the top of the 

 cliff. Five minerals are found here associated in the same mass : 

 apophyllite, datholite, analcime, natrolite, and a little Thomson- 

 ite, with carb. lime in handsome rhombs. All of these minerals 

 except the Thomsonite are crystallized, and are of uncommon 

 perfection and lustre. 



A specimen of apophyllite, taken from this vein, has several 

 crystals of an inch in diameter upon it ; and another piece has 

 a single crystal of an inch and a half in diameter extremely per- 

 fect, except where it is set in the gangue on two or three of its 

 faces ; another specimen shows several faces of a crystal two 

 inches in diameter. 



No. 12, a few feet beyond No. 11, was a vein of Thomsonite, 

 prehnite, and mesotype. Several fine specimens were obtained 

 from it, one of which presents a surface about one foot square. 

 The specimen which matched with it was broken into three 

 pieces in splitting the rock, but they are of very good size. As- 

 sociated with the three minerals just named, are some very fine 

 datholite, and a little hog-tooth spar. This vein was exhausted. 



No. 13, on the north side, a short distance from No. 10, is a 

 vein of datholite, which is uncommonly beautiful. It is about 

 three inches thick at twelve or fourteen feet from the ground, 

 and is lost towards both the top and bottom of the cliff. Asso- 

 ciated with the datholite is apophyllite, and a small quantity of 



