760 



GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



1895. Salt. Holyoke. 



Small cavities, which seem to be flattened and slightly distorted from the 

 cubical form, occur below the Holyoke dam in the Triassic Chicopee shale, (See 

 p. 370.) 



1895. SiDERiTE. Holyoke. 



In trench below Holyoke dam, on fissure surfaces of Chicopee shale of Tri- 

 assic age ; broad surfaces, coated with drusy crystallization, crystals one-fourth 

 to one-half of an inch across, yellow-gray to warm reddish-yellow, with brilliant 

 luster. Forms E, oo E 2, in equal development, which makes the attached crys- 

 tals simulate dodecahedrons, so that they can almost be taken for garnet. 

 Followed by gypsum ( ^), barite, calcite, anthracite, pyrite. (See p. 370.) 



1879. Serpentine. Picrolite. Florida. 



Specimen in collection of Harvard University. 

 Analysis by W. H. Melville. 



Annlyses of serpentine. 



Fe-03 . 



AFO;, 



MgO 



H.2O(100') 



HjO (above 100) . 



44. 22 44. 22 



6. 61 ;^ 



. 53 ;/ 



7.91 



37. 54 I 37. 40 



.36 I .36 



11. 26 11. 22 



100. 52 100. 11 



1897 



1825 



M. E. Wadsworth, Proc, Boston Soc. Nat. His., Vol. XX, p. 286. (See p, 73.) 



Serpentine. Variety picrolite. 



Pelham; asbestos mine at the bottom of the large digging and in tbe midst 

 of the unchanged olivine rock. A thick seam of a leek-green columnar and 

 polished serpentine, plainly produced by pressure and slipping. A thick layer 

 of slickensided columnar serpentine. (See p. 47.) 



Spodumene. Vicinity of Deerfield. (Goshen or Chestei"field.) 



Light gxeen, brittle, exfoliates with blowpipe. Yields prism of 100°; con- 

 tains 8 per cent lithia. Found in a collection of minerals, but precise locality 

 not known. George Bowen, Proc. Phil. Acad. ScL, Vol. Ill, p. 285. 



1825. Spodumene. 

 S, Eobinson. 



Cat. Am. Min. Citation of above. 



1892. Spodumene. Chester. 



E. S. Dana. Sys. Min, Localities, p, 1058, This citation depends on the 

 doubtful report of the species in Chester, in small quantity in granite, by C. 

 Dewey. Geology of Berkshire: Am. Jour. Sci., 1st series, Vol, VIII, 1824, p, 243, 



