270 Brush and Dana—the Spodumene of Branchville, Oonn., 
tite. The presence of apatite would explain the lime found in 
analysis 1 of cymatolite. 
Certain of the sections which show the transition from 
to one another, in other words where the change of the eucryp- 
tite is only partial. This will be understood from fig. As 
18 here seen, some of the fibers are 
7 apparently unchanged, while oth- 
ers are partly altered, the last 
containing many minute scales of 
mica, often packed closely togeth- 
er. These small scales are irreg- 
ularly situated, often across the 
original fiber of eucryptite: the 
direction can always be observed 
both by the cleavage line and too 
by the direction of the extinction 
of the light between crossed Nic- 
ols. Where the process has been 
completed, however, the scale of 
mica is generally parallel to the line of the original eucryptite. 
The eucryptite fibers along this intermediate zone, even when 
mica scales are not visible, have generally lost their smoothness 
of outline, and sometimes have separated into lines of minute, 
irregular, transparent granules. 
e transition of 8 spodumene into cymatolite can also often 
be seen by the unaided eye, along the line of contact. In such 
cases the silvery lines of mica, though the scales are too minute 
to be distinguished, can be seen shooting up into the compact 
B spodumene. 
3. Albite. 
The albite, which occurs pseudomorphous after spodumene, 
appears in several rather distinct varieties. It is sometimes 
finely granular, showing no crystalline structure. Again it hasa 
fibrous structure, similar to that of 8 spodumene and cyma- 
tolite, the fibers transverse to the prism. Still again it 1s 
