378 Clarke and Diller—Topaz from Stoneham, Me. 
Art. XLIX. — Topaz from Stoneham, Maine; by F. W. 
LARKE and J. S. DILLER.* 
In 1882, Mr. G. F. Kunz called attention to a new locality 
for topaz, discovered by Mr. N. H. Perry, of South Paris, 
Maine, in the neighboring town of Stoneham. ‘The announce- 
ment aroused considerable interest among collectors of minerals, 
materials of obscure and doubtful character. This list of species 
was furnished by Mr. Perry, who also supplied us with material 
for investigation. 
In the latter part of 1888, Mr. C. M. Bradbury+ published 
an analysis of the Stoneham topaz, which, if correct, wo ld 
half as high again as the generally accepted formula for topaz 
would require. The figures in parentheses are added to facili- 
Sp. Gr. 3°54 
ls he la ia Sl dls 27-14 (Al,0,, 51°26) 
Bho eels cow cna. wan na - 14-64 (SiO,, 21°37) 
F 29°21 
Dee ei ineann cada n noes 28°56 
99°55 
the crystals of which, having the unchanged mineral at the 
centre, were transformed upon the surface to a dark purple, 
soft substance, easily cut with a knife. Between the purple 
zone and the topaz was a greenish, intermediate layer, which 
shaded off imperceptibly into the original nucleus. : 
Intimately associated with the topaz, in all the specimens 
ived by us, was a mineral identified by Dr. T. M. Chatard 
as damourite. This mineral occurs at the locality in two forms; 
first, as a broadly foliated mica, much like a pale green muse” 
i ae ee ay bosrenhic work described in this paper is entirely 
+ Chemical News, xlviii, 109, 
