scHALi.ER.] MINERALOGICAL NOTES. 139 
.#={8083}: A very doubtful form. 
/ 
o 
/ 
Meas.-.. 65 80 
Calc... 
65 
29 
65 
j&={ll.0.11.4}: A doubtful form. 
o / 

/ 
Meas 66 01 
Calc... 
66 
09 
19 
£ = {10.0.10.3}: A doubtful form. 
/ 
o 
/ 
Meas 69 54 
Calc... 
69 
57 
_/7={7072}: Though occurring but once as a small face, it gave a 
fairlv good reflection. 
o / o / 
Meas 70 57 Calc 70 50 
iT={ll. 0.11.3}: Two faces of this form were noted. 
o / o / 
Meas 71 41 Calc 71 39 
35 
Z- {10. 0.10.1} : Two faces of this form are present on one crystal. 
o / o / 
Meas 82 56 Calc 83 04 
83 21 
The average value obtained for^> is 0.8223. 
19. GLOBULAR LEPIDOLITE. 
Text-books on mineralogy do not mention the globular form for the 
lithia-mica lepidolite. Such globular forms have long been known for 
muscovite, and in fact are by no means uncommon for that species. 
While studying the literature of lepidolite in general two occasions 
were noted in which globular lepidolite was spoken of. 
One was by vom Rath ff in describing the litbia deposits of the island 
of Elba. On page 649 he says: " Zuweilen sind die (lepidolite) Blatter 
zu Kugeln gruppirt" — at times the (lepidolite) plates are grouped in 
spheres ( = globular). 
The second mention was found in Hamlin's 6 book on Mount Mica, 
Paris, Me., in which he says: 
On November 20, 1822, E. L. Hamlin sent to Professor Silliman, at Yale College, 
a box of minerals from the locality, with letters and catalogue as follows: * * *. 
In the catalogue Mr. Hamlin mentions lilac-colored mica as found in small globular 
concretions. 
A large specimen of the pegmatite rock in front of Mr. Bowker's 
barn, at Mount Mica, shows a number of these spheres of lepidolite, 
«Vom Rath, G., Die Insel Elba: Zeitschr. d. d. geol. Ges., vol. 2'2, 1870, p. 649. 
b Hamlin, A. C, The Hi.stpry of Mount Mica, pp. 16-17. 
