A. A. Hayes on Borocalcite. 95 
Art. XIV.—Reclamation of Borocalcite, as distinct from a miz- 
ture of minerals, found near Iquique, South Peru; by Ave. 
A. Hayes, M.D., Assayer to the State of Massachusetts. 
Ts mineral which was early analyzed and described by my- 
self, has under the name of T'eza, been confounded by Messrs. 
Ulex and Lecanu with other minerals which occur with it in 
the same bed. These chemists have apparently analyzed the 
minerals, constituting distinct species, together, without that care- 
ful separation mechanically, which should always precede a 
chemical analysis. 
The parcel I originally received from John H. Blake, Esq., 
weighed several hundred pounds, and the existence of other salts 
with the borocalcite, was pointed out by me in detail. Yet, 
there were nodular masses frequently found, containing mere tra- 
ces of other compounds, and quite as pure as commercial salts in 
general. 
: Supposing that future explorations had shown a more intimate 
union of the different salts, I have refrained from noticing the 
discordant results obtained by others, until the mineral as au arti- 
cle of commercial importance, should come to my hands. 
Within a few weeks, the “muster” samples of two hundred 
tons have been sent to me, and I give the results obtained by 
careful analysis of these, as follows: 
Water of crystallization, - - - 27-16 
Anhydrous borate of lime, - - - 41-34 
Glauberite, - - - + . 23-20 
Chlorid of sodium, - - - - 6:40 
Sand, Sey he rae ae eer 1:90 
100-00 
Some samples could be differently reported, but the point 
Which I deemed essential, after reading the statement of M. Le+ 
can was, the absolute proof obtained by different modes of anal- 
Ysi$, of the entire absence of any borate of soda, in the samples. 
The Glauberite and common salt are mere mixtures, apparent on 
‘nspection, and most easily separable by washing,—the borate of 
16 Boylston St., Boston, 3d Apr. 1854. 
