286 GEOLOGY OF THE SECOND DISTRICT. 



4. Quartz. Good specimens of cr}'Stals are unknown ; small ones occur at Crown-Point, and tolerable 

 good masses of rose quartz half a mile north of Port Henry. 



5. Pyroxene. It is found at numerous places, and under a variety of forms. The most perfect crystals) 

 as well as best of the coccolitcs, are to be obtained at Long pond. 



6. Hornblende. The localities of common varieties are numerous, and tolerably good. Actinolitc has 

 been procured from near the beds of primary limestone. 



7. Ser'pentine, usually associated with carbonate of lime. Beautiful serpentine exists at Port Henry^ 

 with scams of fine asbestus, and a radiated mineral similar to talc ; but its nature has not been deter- 

 mined. 



8. Scapolile. It occurs in large crystals at Long pond, and in small ones in Schroon ; they are often 

 coated with a thin brouTi film, which has some resemblance to brown tourmaline. It occurs at 

 Keene, under one of its secondary forms : crystals, long and striated, terminated by a four-sided 

 pyramid. 



9. Garnet. This substance is not common in Essex county; a poor brown variety may be obtained at 

 Crown-Point. Colophonite has long been known in AVillsborough ; it forms a vein in gneiss, with 

 hornblende on one side, and tabular spar is intermixed with it. Light brown amorphous garnet is 

 found at the same place. It is sufficiently abundant, but cannot be procured without blasting. In 

 some parts of the vein, it is exceedingly beautiful. 



' 10. Tabular spar. It occurs in a much finer state in Keene than at Willsborough. Near the former 

 locality, I observed crystals of quartz, associated with a substance resembling prehnite, which I then 

 supposed was new, and therefore named it chillonite, but it is still a doubtful substance. These 

 three minerals belong to the hypersthene rock. 



1 1. Eupyrchroite, is the name I gave a mineral found at Crowm-Point. Its name was suggested by its 

 property of phosphorescing when slightly heated. Its light is a beautiful green, but quite transient. 

 It appears from Dr. Beck's analysis, to be a phosphate of lime. It occurs in mammillary forms, 

 similar to some varieties of malachite. It is green, but becomes pale, and even white on exposure 

 to the weather. Though it does not occur under a regular form, yet it is a beautiful mineral. 



12. Brucite, or Clwndroditc, of a good yellow, in primary limestone, may be procured in Schroon, 



about one mile east of the post-office, on the road leading to Crown-Point. This is a good loca- 

 lity, though the quantity of the mineral is not abundant. Its color is finer than that in Orange 

 county. 



13. Spinelle, in small imperfect crystals. Color rose-red, but rather pale. They are not particularly 



important, except as furnishing a clue to better specimens. A few crystals of green spinelle, at 

 East-Moriah, were found the second year of the survey; but after further search, no additional 

 discoveries have been made. 



14. Tourmaline. Brown tourmaline maybe obtained at Schroon. The smaller crystals are nearly 

 translucent. Two crystals were found with a greenish tinge upon the outside, and reddish within. 

 This locality is worthy of a careful examination. Scapolite, brucite, reddish spinelle, yellow and 

 brown tourmaline, are all obtained at the same place. 



15. Zircon. Only a few crystals were observed in Schroon, near the locality of tourmaline. I found 

 also at New-Sweden, on the Ausable, tolerable good specimens of zircon. 



16. Mica. Six-sided tables of mica may be obtained also at Schroon, at the locality already specified. 



They are small, but transparent in a direction perpendicular to the prismatic axis. A blood-red 

 variety has been found at Moriah. 



