F.. A. Genth—American Vanadium Minerals. 85 
A mineral, very similar in composition and perhaps a com- 
pact impure variety of roscoelite is found associated with the 
scales. It has the appearance of a massive dark green chlorite 
or that of some varieties of serpentine. The analysis was made 
by fusion, &c., and gave: 
SiO, = 46°09 Na,O = 0-18 
Al,O, =1746 K.0 <= eee 
eO = 1°95 o,; =e 
MgO = ae Ignition = 6°37 
100°42 
2. Psittacinite, a new hydrous vanadate of lead and copper. 
In a paper on American Tellurium and Bismuth minerals, 
read before the American Philosophical Society at the meeting 
of August 21st, 1874 (Proc. Am. Phil. Soc., xiv, 223-281), 
I mention, on the authority of Mr. P. Knabe, a siskin-green 
ulverulent mineral from the “Iron Rod Mine,” Silver Star 
istrict, Montana, as a new “ Tellurate of lead and copper.” I 
had at that time no opportunity to examine into the merits of 
this mineral, having mislaid the small sample which he had 
sent me. On receiving a copy of my paper, Mr. Knabe fur- 
nished me with several specimens, which gave me a sufficient 
quantity of fair material for an analysis. A qualitative exam- 
mation proved it to be a hydrous vanadate of lead and copper 
and not a tellurate. 
When I communieated this result to Mr. Knabe he gave me 
an interesting account of how he fell into his error. At the 
Uncle Sam’s Lode, in Highland District, occurs with the 
tetradymite a siskin-green mineral, which has not yet been 
analyzed, but which appears to be a tellurate. It looks exactly 
like the pulverulent variety of the psittacinite from the Iron 
Mine. When Mr. K. 2 Sather the latter in hydrochloric 
acid, the evolution of chlorine indicated the presence of a higher 
oxide; the solution precipitated with an excess of ammonic 
sulphide gave sulphides of lead and copper and a filtrate which, 
on addition of an acid, gave a black precipitate—vanadic sul- 
phide—which he mistook for tellurous sulphide. : 
Psittacinite occurs in very thin cryptocrystalline coatings, 
sometimes showing a small mammillary or botryoidal structure, 
¥so pulverulent; color siskin-green, sometimes af 
‘int, to olive-green. Before the blowpipe it fuses easily to a 
black shining mass. With fluxes gives the reactions of vana- 
dium, lead and copper. Soluble in dilute nitric acid, the solu- 
Hon yielding on evaporation a deep red mass. _ 
8 it was impossible to get any of the mineral in a pure 
state, I had to use coatings with quartz attached to them, some- 
‘umes contaminated with a little limonite; but these admixtures 
