112 C. U. Shepard—Mineralogical Notices. 
Oxygen. Ratio. 
Al, 15-06 7-08 : 
Be, 3-08 90 ; — 
Ja, 645 184 ) 89 ee reat a. at: 
Me, oa8 hits 2821 R: 8: Si: H=1:3:11:6 
Hy, 1640 1460 1460 5 
Si, 5660 38015 3015 12 
question. 
2. Octahedral Garnet at Middletown, Conn.—Ever since the 
china-stone quarry of feldspar has been wrought at Middle: 
town, I have known of the occasional finding there of precious 
rnet in small drusy masses, either loose in cavities of feld- 
of columbite, which shows distinct octahedral faces, thus evine- 
ing fee relationship of the substance with the octahedral garnet 
of Elba. : 
margarite. Jlmenite, in thin curved lamina, is likewise asso- 
ciated with the margarite. 
4. American Sienna.—A valuable repository of this precious 
pigment exists in the town of Whately, which will soon be re- - 
ported upon, and is destined to be brought into extensive use. 
5. Diaspore in the Emery-rock of Chester, Mass.—I found this 
mineral on the surfaces of cross-joints of the emery-rock about 
a month since. It was associated with rose-colored amphode- 
lite. On visiting the locality yesterday, I again discovered it 
imilarly ginal but associated with radiated epidote; and in 
! This is the mineral which Dr. Jackson, in his account of lodsltiy, 
pen felon if : of the emery locality, 
