A. H. Chester—Mineralogical Notes. 987 
arrives at the same conclusion. The crystals I have been able 
to find on these specimens are few, small and imperfect, but 
the faces O, 1-2 and 4-7 have been recognized showing angles 
approximately near the correct ones. 
3. ZINKENITE. 
A sample of bindheimite from the Stewart Mine, Sevier 
County, Ark., has at its center a compact massive mineral of 
dark gray color, consisting of lead, antimony and sulphur only. 
A partial analysis of the pure homogeneous mineral shows 
34°77 per cent of lead, and indicates that it is zinkenite. The 
occurrence of this rare mineral among the Arkansas antimony 
ores is suggested by Professor Charles HE. Wait;* and Mr. W. 
F. Hildebrand+ describes zinkenite from Colorado very similar 
to that noticed above. 
4. BROCHANTITE. 
A specimen of brochantite from Chili gave the following 
analysis, after deducting 4°45 per cent of insoluble matter, and 
calculating to one hundred per cent. - 
Ota OE a ems 55 lea aad ag PE Ne 71°73 
SO ae hs Dar MON, Mn INNER 18°21 
EKO ae Gee ee NRE 10°06 
This corresponds well with the formula Cu,SO,+23H,0, 
which requires CuO 71:84, SO, 18:16 and H,O 10:00. The 
mineral occurs in small tufts of delicate fibrous crystals, verdi- 
gris to emerald-green in color, associated with linarite, in a 
quartz matrix. 
5. PECTOLITE. 
A specimen of okenite, so-called, from Disco Island, Green- 
land, afforded the following analysis: 
SO als Rr Bios ie tab ME eo chs 52:86 
CAO PRAT sea freak PAL TENE Mth ey aay kota 34°33 
PNUD) 5) cheerios hl eg hat SURG EPS Me Wea tte FR 0°71 
ORK) 2a a ue el Vc alt “Upon, ony LN as ce 7°50 
RO eet i i CONT UY OCD Pn 0:47 
[LAO POP ek Aa Re NG a te ange et ee ie 4°70 
ATR tral tea epee ser yeh LA eth eet UE ak AT 100°57 
* Trans. Am. Inst. Min. Eng., vol. viii, p. 51. 
¢ U.S. Geol. Surv. Bull. 20, p. 93. 
