Mineralogy and Geology. AI7 
Tn its behavior before the blowpipe, = also with respect to acids, it 
does not differ from allanites from other sources 
A qualitative examination ciaheideniial ibe presence of substances 
already known to occur in this mineral ; it dues not contain glucina or 
upon mineral substances of this nature. The amount of water was de- 
rived from the loss of the mineral in weight by wre toa ved heat. 
The result of the analysis abner 
Si I Fe G Me 
33°833 13°606 3°330 12716 0824 20° 902 watt 1404 2950 = 99-093 
tae the occurrence of Crystalline Zinc Oxyd as a Furnace pro- 
n New Jersey; by Mr. W. P. Biaxe, Gickiudiniete? for this 
Trae )—I have recently had an opportunity at the New Jersey zinc 
mines to observe some beautiful crystallizations of zinc oxyd formed 
not only in the large furnaces used for the. manufacture of the amor- 
phous white oxyd, “but also in the roasting eas. and under other cir- 
cumstances. which show that the crystals can be produced with great 
acility. 
The blocks of red zine after being roasted are frequently coated in 
small patches with delicate acicular transparent crystals of oxyd. The 
Toasting heap is prepared by piling up the ore with a small quantity of 
‘ood and anthracite coal, and subsequently igniting it; under these 
circumstances a_ portion or the native oxyd must be reduced to zinc 
vapor, and this is probably the source of the crystals. 
I have also noticed small transparent crystals of the oxyd lining cavi- 
ties in a * matte” or a mass of partly re ee oe sabe which was 
formed in some experiments for reducing | a furnace.* 
ecently large masses and incrustations of oxpibilinn oxyd have 
been taken from one of the large furnaces which are used to produce 
the zine-white. The oceurrence of such large and beautiful masses, 
phous white powder to translucency and the clear crystalline condition. 
_ Masses of oxyd in various conditions of aggregation, exbibit- 
ing a great variety of forms: sometimes in masses of delicate acicular 
crystals, beautifully eg more frequently in globular mas- 
* About ayer st snes. J. Samuel Wetherill of the z zine works in making 
experiments re, found his crucible filled with Me white, silky ne 
tals. Tam indie ted i to ae Richard Jones, the superintendent © zi s for 
a mass of t which he preserved with mitre be Sheva 
ps re zine ox ayaa of the eusls are over-ap inch in length, the 
ut very brittle, px mc resemble threads, The evaciae in whieh ie were 
rmed was closed with a luted cover; ees ee ee Te ed hare 
it was ‘remain’in the fire 
highly 
Szconp Series, Vol, XIII, No. —— 1852. 53 
