Ses 
. ro ; 
Notice of Danburite, a new Mineral Species, 137 
when required, it is poured back again into the basin () without disturbing the 
K.) 
Fig. 6, (a,) a glass oylttiieteal vessel, containing about a "quarter 7 a pint, filled 
with a concentrated solution of silicate of potash. (,) a fine silve formed 
into a coil, which is immersed into the fluid in the cylinder, the sala end being 
connected with the negative pole of the battery, (c,) an iron wire about one fifth 
of an inch in diameter, bent somewhat in the form of an inverted syphon, immer- 
sed in the same vessel, and connected with the positive pole of the battery. (p, D) 
insects in their incipient state making their appearance, some on the gelatinous 
silica which partially-covers the wire, and some on the naked wire itself. These 
insects appear magnified. eee £7 
Art. XL—Notice of Danburite, a new Mineral Species ; by 
Cuartes Upuam Sueparp, M. D., Professor of Chemistry in 
the Medical College of the State of South Carolina. 
- Tue enitierel here described, I found upwards of two years 
ago, while engaged in the geblogical survey of Connecticut. It 
was collected’ in the town of Danbury near the manufactory o: 
Col. Wurre, and occurred in small masses of a delicate bluish 
white and highly erystalline feldspar, found among fragments of 
dolomite, coming from a bed in place near the mills. ‘The feld- 
spar is extremely fetid, when rubbed or broken: in which respect 
it resembles the same mineral found in thin veins of dolomite 
at a locality a few miles distant, in bie town of Brookfield,—a 
circumstance which leaves little r o doubt that the specimens 
at Danbury, ica fee detached, were nevertheless derived 
from the dolomi 
ae ines alia as aie observed aiiocinbinvediie 
small. quantity through the feldspar (with which is likewise asso- 
ciated a small quantity of quartz) in fissures and eavities ties havi 
the shape apparently of oblique prisms. Owing to the partial de- 
composition of the mineral (a change to which it appears ‘to be 
particularly liable) these cavities are sometimes entirely empty. 
The longest of them noticed was above an inch in one direction, 
by one fifth of an inch in another. © 
Whether the mineral will be found in any Peonltigaine quantity, 
Tam unable to say. ‘The specimens collected, have been barely 
sufficient to afford the following notice. 
Vou. XXXV.—No. 1. 
