147 



According to Mr. Dana, the crystals from Johnsburg, in Warren 

 county, sometimes have a tesselated structure. The accompanying fig- 

 ure represents the appearance of one of the crystals. Sill. Jour., xlvi., 



p. 36. 



CLASS VII. 



METALLIC MINERALS. 

 NATIVE IRON. 



(Mineralogy of New- York, page 382.) 



Since the publication of my Mineralogy, several interesting facts in 

 regard to the occurrence of native iron in this State have been made 

 known. 



Dr. Emmons has described a specimen which he calls native iron, 

 said to have been obtained from the vicinity of Catskill, in Greene 

 county. It is in the form of laminae, which are about one-thirtieth of an 

 inch in thickness. Sp. gr. 6 • 58. It dissolves completely in warm sulphuric 

 or muriatic acid, and when nitric acid is added, ammonia precipitates the 

 peroxide of iron. It is strongly attracted by the magnet. The laminae 

 are only slightly flexible, but are entirely destitute of malleability. 

 Amer. Quart. Jour, of Science, ii., p. 367. 



B. Silliman, Jr., describes a mass of meteoric iron found a short dis- 

 tance below the surface of the earth in Cambria, near Lockport, Niaga- 

 ra county. On analysis it was found to contain iron 94*22; nickel 

 6*35. Sill. Jour., xlviii., p. 388. 



For a notice and analysis of a mass of meteoric iron found in the town 

 of Burlington, Otsego county, see Sill. Jour., xlvi., p. 401. 



MAGNETIC IRON ORE. 

 (Mineralogy of New- York, page 383.) 

 Crystals of this mineral have been found in a mine near Port Henry, 

 in Essex county. They are regular octahedrons from J to § of an inch 

 in diameter, and are strongly magnetic. For these interesting speci- 

 mens I am indebted to Mr. Charles Thomas. 



