Clarke and Chatard—Mineralogical Notes. 23 
6. CIMOLITE ? 
Among a collection of Maine minerals received from N. H. 
Perry of South Paris, were several specimens of tourmaline 
and albite encrusted with a pink to rose-purple, earthy, altera- 
tion product. The color was found to be due to a little man- 
ganese, which was not, however, separately estimated. The 
analysis (Clarke), gave results approaching to those required by 
= rational formula AIH,(SiO,),, as the subjoined figures 
show. 
Found Theory 
W ater oo! oo eee 10°4 
POR Ge 70°06 69°8 
Alumina*® ___...-- 17°19 19°8 
O08 ooo ae Or te 2S 
Magnesia 3.220% "80 100°0 
99°86 
It will be observed at once that these results do not agree 
exactly with those commonly obtained for cimolite. ey are 
too high in silica, and too low in water, and the formula 
deduced from them is somewhat novel. We are inclined to 
7. HALtwoysire. 
Collected by Ensign J. B. Bernadou, at the Detroit Copper 
Mine, near Mono Lake, California. The specimens consisted of 
by F. W. cl 
BT SUNS ane Dina treat eng tee Tle F 
ER i a SNe Rien aa 42°91 
Alumina _..- cant ee ket 
99°99 
* Including a little manganese. 
