and the Results of its Alteration. 277 
Spodumene, B Spodumene and Cymatolite—It only remains to 
speak of the cases in which all three of the minerals named 
case. In figs. la, 1b, 1c, there are represented three sections 
across the same crys stal, This crystal had a len ngth of 15 
inches, a width of 44, and was 1 coat in thickness; it was well 
terminated at one extremity. The sections, taken in order 
umene ape as a lean on the lower surface, and the c teat (c) 
as a thin coating more or less continuous ae 
No. 2. (fig. 1b) shows no spodumene, but the # s ptiiied 
forms the greater part, though the cymatolite oe increased 
much beyond the first section. No. 3 (fig. 1c) shows only the 
cymatolite. 
though the " cymatolite is only sparingly Be and that on 
the edges. In figures 8 and 14 the sp 
the cleavage. It is surrounded spodumene and cyma- 
tolite, the latter ious out from the centers of spodumene. 
Crystals, in which only spodumene and cymatolite are present, 
are rare. In a single narrow band is shown which is 
‘Albite ome Cymatolite—The albite, as has already been 
remarked, is a common mineral among these sinuieeariha 
In some cases it makes up almost the entire crystal, and again 
it is present only in small isolated portions. e commonest 
form is that which is very ae Ser mys the fibrous 
form is not rare. It is to be remembered, however, — 
between the normal pyeaticlebs (1 sea dibite 4 1 mol. mu 
vite) and the pure albite on the one hand, aa the pure mus- 
covite on the other, there are many gradations. 
Figure 8 is a vertical section of a portion of a crystal, the 
exterior of which is fibrous cymatolite (c), and the interior 
granular albite Gy vith some bands of microcline (m). Fig. 7 
is a section across a large crystal in which the two ‘minerals 
are similarly disposed. Fig. 10 shows the albite and microcline, 
as also 11 and 13. Figs. 6, 8, 12, 14 show the way in which 
we H gan ela albite is intermixed with the other species which 
e been mentioned. In still other cases, the albite is in 
doe curved plates, which would seem to have nothing of 
a pseudomorphous character except that the outlines of the 
spodumene crystals, of which they form a greater or less part, 
are still distinct. 
