‘ 
214 G. F. Kunz—Minerals from Stoneham, Me. 
equivalent to silicon being thus replaced, we have three-fourths re- 
d 
I send you the results for what they are worth. This may be — 
times transparent in very small fragments. The quartz at its 
junction with it is often stained black as if the mineral had — 
partly decomposed. . % 
Triphylite—Only one very imperfect crystal of this mineral 
was found. 
Montmorillonite.—Occurs in masses that vary in color from ® 
very delicate pink to a dark pink closely approximating 10% 
filling the cavities and interstices in the cleavelandite. hen 
the latter is broken, it falls out, and it so far retains the impres 
; | 
resembling rhodocrosite on crystals of cleavelandite. This. 
mineral is evidently identical with that described by Professors — 
al as 
Columbite is scattered all through the evel either : 
on crystals of the latter in cavities, or else between the plates — 
of this mineral. These crystals vary in length from 1 to 10%, 
and are not very perfect. “In one curious occurrence a number — 
of acicular crystals of this mineral are so bunched together a — 
to have a fibrous appearance, yet each crystal is distinct. One - 
int 
4 
Autunite was observed in minute scales on the cleavelanditt : 
_ Beryl occurs in large erystals all through the rock, and nies 
times in contact with the larger topaz which it strikingly ys 
* Resembling zwieselite of Fuchs. See Dana’s System of Mineralogy, bth obey 
p. 544, 
+ This Journal, IIT, xx, 283, 1880. 
