20 Clarke and Chatard—Mineralogical Notes. 
Asi IIL — Mineralogical Notes from the pete of the U.S. 
Geological Survey; by F. W. CuarKeE and T. M. CHATARD. 
THE following analyses of minerals have been executed by 
us in the laboratory of the U. 8S. Geological Survey, during 
the past few months. Some of them possess more than ordi- 
nary interest, and all have value sufficient to warrant putting 
them on record. The only novelty ge the methods of analysis 
has been in the determinations of the alkalies. These determi- 
nations were made by a acihastiah, of Hempel’s process for 
decom posing siliontes by fusion with bismuth oxide. An 
account of the process, as improved and used in this labora- 
‘tory, will in due time be published. 
1. JADE AND PEcTOLITE. 
Am ong the Eskimo implements collected by the U. S& 
Alask 
Signal Service at Point Barrow, Alaska, were a cH rages 
number of a material which appeared to be jade. Of thes 
there were two varieties; one pale apple-green, the other daik 
green; both were hi ghly polished, and ex xceedin ngly oir 
and tough. The sp. gr. of the pale green variety was 2°878, 
that of the dark material was 3-012. Analyses (Clarke) gave 
results as follows: 
Pale-green. Dark-green. 
Waters: --. ccs 4°0 1°4 
POA ee cee. 53°94 57°01 
Sasha oxide ___ trace. 6°95 
idee a cts 21 12°75 
Magnesia ecu oak 1°43 21°36 
AyOe es “58 42 
ht ES OS aay goa EDs 8°57 lik 
100°82 99°90 
The dark-green material is plainly jade, or nephrite, quite 
analogous in composition to that from the Swiss Lake-Dwell- 
ings. e light green mineral, on the other hand, agrees in 
‘composition with pectolite. It is easily fusible, and has, in 
short, all the essential properties of eaioline It i is, therefore, 
a new and interesting variety of that well-known species. 
The Eskimo of Point Barrow say that the jade and jade-like 
minerals used by them come from some point to the eastward. 
The locality itself, we believe, has not yet been visited by she 
ilized men. Whether both minerals ‘are found at the sam 
place or not, cannot be stated; but i that before pasa i 
more definite information may be secu 
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