° 
362 A. Arents on Partzite. 
Arr. XL.— Partzite—a new mineral; by ALBERT ARENTS, 
Mining Engineer and Metallurgist. 
® 
THIs mineral was discovered early in the year 1865 in the 
Blind Spring mountains, situated in Mono county, California, 
and first denoted as a silver ore by Dr. A. F. W. Partz, for 
which reason I aed, to it the above name. 
It has hitherto never been found in crystals or of a crystalline 
structure, but always in amorphous masses generally without 
luster and rarely of a ee appearance. Its fracture varies 
from conchoidal to even, and its color from yellowish-green to 
blackish-green and black—the i chiee. -colored portions contain- 
ing the most silver. Oftentimes the mineral has considerable 
—— to the product obtained during the middle of the 
poe riod in psc BPN The amount of silver it contains 
etween 4 and 12 per cent. 
om aye veins of t the Blind Spring district the Partzite tga 
in irregular deposits which are often nodular in shape, a 
casionally occupy for a distance of many feet the whole adil 
of the veins. 
Its sp. gr. is 3°8; its H.=3-4, Before the blowpipe on plati- 
num it is melted, but with difficulty, to a black slag; on charcoal, 
and especially by adding soda and pulverized charcoal, a metal- 
lic eatin is easily obtained which bears much re semblance to 
pure antimony. SO,, CIH, and NO, esses the mineral 
even in ak cold, liberating oxyd of antimony and forming a cop- 
per-silver solution 
An analysis of the mineral shows the sae iee ere Net 
Relation ef oxygen. se tion of equiv: 
SbO, = 4765 747 7-47 mT = 0311 = 1 
CuO = 38211 647 a 
neo eyo 04a [Et me 
PO = 901 014 7 ge ee POR et 
FeO = 2°33 0°51 4-37 
98°51 
From the above it will be seen that for 1 eq. of acid there are 
3 eq. of bases and 3 of water. We thus obtain the follow- 
3 eq. 0 
"ty cae (CuO, AgO, PbO, FeO), SbO,+3HO. 
f arsenic but slight traces, were detected which, however, 
in all probability were due to the presence of fine reticulations 
of a brilliant green color, by which the mineral is more or less 
nthe Pant 
e Partzite occurs together with argentiferous ena, in 
veins of a magnitude varying from nine he ee and 
has already become the object of extensive arte’ pa 
