86 
POPULAR SCIENCE REVIEW. 
The litliia is in larger quantity than in specimens of spodumene from 
any other locality. As a result of the alteration of the spodumene, two 
substances were found, one, which the authors term j3 spodumene, which is 
made up of albite and a new lithium mineral, to which they have given the 
name of eucryptite ; and the other is cymatolite, an aggregate of albite and 
muscovite. Eucryptite dissolves with gelatinization in hydrochloric acid and 
has the composition Li 2 Al 2 Si 2 0 8 , and the albite Na 2 Al 2 Si 6 0 16 . 
The cymatolite received its name, in 1867, from Shepard, having been 
found at Goshen and Norwich, Mass. The specimens found by the authors 
of this paper have the composition : — 
Silicic-acid . 
. 60*55 
Alumina 
. 26*38 
Manganese oxide . 
0*07 
Soda 
8*12 
Potash 
3*34 
Lithia . 
0*17 
Water 
1*65 
100*28 
This has the composition of one molecule muscovite and one molecule of 
albite, which is curious. With these minerals occurs microcline, having the 
composition : — 
Silicic acid . 
. 64*55 
Alumina 
, ■ 
. 19*70 
Potash 
, 
. 15*62 
Soda 
, 
0*56 
Ignition 
• 
0*12 
100*57 
This is largely used for making porcelain ; it is obtained in cleavage masses, 
as large as can be handled and nearly pure, a single continuous cleavage- 
surface ten feet long has been observed. After describing the killinite found 
associated with these minerals, we have some interesting speculations on the 
relations in method of occurrence between the various minerals produced by 
the alteration of the spodumene ; and the genetic relation between the original 
spodumene and the various products of its alteration, concerning which we 
must refer the reader to the paper itself. 
Peckhamite. — This name has been given by Dr. Lawrence Smith, of 
Louisville, Kentucky, to a new meteoric mineral occurring in the Emmet 
County meteorite. When broken, this mineral has a greasy aspect, and a 
more or less perfect cleavage, and its yellow colour has a greenish hue. In 
structure it differs widely from olivine, as may be seen under the microscope. 
Small rounded nodules, several millimetres in diameter, are found in the in- 
terior of the mass, sometimes of irregular form, from which fragments nearly 
pure can be detached. Its specific gravity is 3*23, and chemical composition 
was found to be Oxygen. 
Silicic acid . . 49*50 49*59 25*73 
Iron protoxide . 15*88 17*01 3*77 
Magnesia . . 33*01 32*51 12*76 
98*29 
99*11 
