292 PHYSIOGRAPHY. 



Kerolite. 



Compound Varieties. Massive : composition broad co- 

 lumnar, curved, lamellar and divergent : also botryoidal in 

 cavities, and impalpable. Sp. gr. of the compact =2*2... 

 2*3. Color white, tinged by grey, green and red. 



1. Before the blow-pipe, when heated suddenly, it decrepitates vio- 

 lently ; the fragments becoming white and harder. In very small frag- 

 ments, if the heat is gradually applied, a roundish enamel-like edge is 

 produced ; but unattended with any ebullition. In powder, with borax, 

 the lighter colored varieties produce a perfectly colorless glass ; the 

 blackish green variety affords a greenish transparent glass. Pseudomor- 

 phoses in the shape of Quartz, Hornblende and Spinel. 



2. Analysis. 

 By PFAFP. By NUTTALL. By STEEL. By SHEPARD. 



Magnesia 



Silica 



Lime 



Water 



Protox. iron with) ^ : . 6 _ ^ _ Q Q() _ 



traces of chrome > 

 Alumina - 12-18 - 00 - 1-000 - 0-00 - 0-000 

 Peroxide of iron 0-00 - 0-0 - 0-400 - 0-00 - 0-000 



3. The present species is found in veins in serpentine, and dissemina- 

 ted through Schiller-Spar. 



4. The Kerolite was first described by BREITHAUPT, as occurring in 

 reniform masses, in plates and compact, with a hardness = 2-0. .. 2-5, 

 and sp. gr. = 2-33 . . . 2-4, having a resinous lustre, and occurring in thin 

 seams in serpentine, at Franckenstein in Silesia. The Marmolite of 

 NUTTALL must be referred to the same species ; it occurs at Hoboken, 

 (N. J.) where it is found forming narrow veins in serpentine ; and from 

 whence is derived the specimens possessed of a distinctly crystalline 

 structure. It also occurs at this place possessed of an impalpable texture, 

 but only in small quantities. A leek green and blackish green, variety, 

 in curved and stellular laminae, occurs at Blandford, (Mass.) engaged in 

 Schiller-Spar. The compact variety of the United States, and which 

 has been called JDeweylite, by EMMOJTS, is found in seams and ir- 

 regular veins at Middlefield, (Mass.) at Cooptown, Hat ford county, 



