282 Brush and Dana—the Spodumene of Branchville, Conn., 
given above, and the silica thus set free may have played a 
part (see equation 4) in the formation of albite. It is interest- 
ing to note that the killinite was probably always formed im- 
mediately from the original spodumene, since it so commonly 
shows its cleavages. 
General Summary.—The remarks in the preceding para- 
In 
result was a coarse mixture of the mica and the two feldspars. 
Finally, the action of the potash solution, and the simultaneous 
loss of silica, led to the formation from the original spodumene 
of a mineral very closely related to mica, namely, killinite. 
Two questions arise here, to neither of which we can give a 
very satisfactory answer. ‘The first is as to the source of the 
a and potash involved in the changes that have been de- 
is certainly an original mineral of the vein, and occurs rather 
abundantly with the massive spodumene. Its decomposition 
has also led to an increase of this supply of lithia. Furthermore, 
it is more than possible that the Abeta of the remarkable 
series of phosphates of manganese, described by us from this 
locality, was connected with the extensive changes in the 
spodumene. The fact that two of the phosphates are almost 
