262 
[Assembly 
The name of Chiltonite is conferred in honor of the late George 
Chilton, of New-York, whose merits as a mineralogist and analytic 
chemist, were highly appreciated by men of science. 
2. Eupyrchroite? 
Colour pale malachite-green, passing also into greenish white, and 
sometimes brownish. Structure indistinctly fibrous in the thin mam- 
milated layers, which are arranged like those of green malachite. Co- 
lours of the separate layers various. Dull and opake. Hardness = 4, 
sp. gravity 3.06. 
Chemical Characters. — Fusible before the blow-pipe with difficulty, 
after a long continuance of the blast, and on the surface only, into a 
glassy glaze. Decrepitates: with borax and salt of phosphorus it fuses 
into a pale bottle green glass when hot or warm, but transparent when 
cold. Heated to a point just below redness it phosphoreses w^ith an em- 
* erald green light. Heated in a glass tube it gives off a little vapour. 
In muriatic acid it dissolves easily and perfectly with a slight ebulition ; 
from this solution oxalate of ammonia throws down a white precipitate; 
also the carbonates of ammonia and soda an abundant white flocculent 
precipitate. The muriatic solution evaporated to dryness is perfectly re- 
dissolved by acidulated water. 
Observaiions. — This remarkable mineral occurs at Crown Point, not 
far from the landing. It has a resemblance to malachite, somewhat in 
colour and structure, but evidently contains no copper. Its place in 
the natural system is in the genus Wavelline spar. It has in fact in its 
external or natural historical characters as well as chemical, quite a 
striking resemblance to Wavellite and Gibbsite. It occurs abundantly in 
tuberose and mammilated masses in gneiss. 
Its name, Eupyrchroite^ has an allusion to its beautiful phosphores- 
ence by heat or fire. 
In conclusion, it is proper to remark that it was not intended to de- 
scribe the above named minerals in this report until it was too late to 
procure perfect analyses of them, though I was early satisfied they were 
not described in any work on mineralogy to which I have had access. 
