| en a a ee eee ne 
Sehica nals . a Bec coi 
a Sa 
F. A, Genth’s Contributions to Mineralogy. 208 
them, the latter certainly as chromic iron, which I haye observe 
with a good magnifier in exceedingly fine particles or even in 
9 eran of the Ferme eter Meee on lustre 
om numerous localities. B.B. i isti 
the chrome reactions, Oe Sessa? 
13, Serpentine. 
f Penrmeston with the preceding paragraph, I will mention a » 
pi €rvations of serpentines, resulting from the alteration of 
oct minerals, which lately have come to my notice. 
Tex. . collection I have specimens of fibrous serpentine from 
fibres ancaster county, Pa., of a greenish white color. The 
dis tit about 1} inches long and separate very easily. It has 
ake re, and evidently results from the alteration of asbestos ; 
ap examination proves it to be pure serpentine. 
he so-called “ baltimorite” is certainly nothing else but a 
pseudomorph of serpentine after asbestos. 
hd eae of chrysotile with silky lustre and a greenish, 
inch and greyish white color, the fibres from three to four 
eb ga from Providence Township, Delaware county, Pa., 
th Originates from asbestos, which, of exactly the same struc- 
*€, 18 still found in the neighborhood. 
P hother piece of chrysotile from Marble Township, Del. county, 
*, was formerly bronzite. It consists of small roundish masses 
Oo . . ®: 
of +t 
~ alterat; “Os Seon he ; : 
lteration of actinolite; it is of a greenish white color and some- 
Mi = silky lustre, shows still the divergent structure of the orig- 
al Mineral. It is imbedded in massive, somewhat granular, 
ht not be an original mineral, 
ll the above observations 
how conclusively that, 
lt of the alteration of 
Ino time in doubt, whether it mig 
and the one crystallized as such—but a 
like it of its occurrence appear to s 
other Vem hetaad serpentines, it is the resa 
tid Ee 14, Kerolite. ee 
logt ilk-white inclining to blueish-white kerolite, with waxy 
SS aia Harford county, Md., which I have examined in my 
Y contains: 
