Notice of Danburiie, a nexo Minei^al Species. 137 



when required, it is poured back again into the basin (h) without disturbing the 

 stone (k.J 



Fig. 6, (a,) a glass cylindTical vessel, containing about a quarter of a pint, filled 

 with a concentrated solution of silicate of potash, (b,) a fine silver wire formed 

 into a coii, which is immersed into the fluid in the cylinder, the other 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, (d, 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. 



Art. ILl.— Notice of Danburite, a new Mineral Species ; by 

 Charles Upham Shepard, M. D., Professor of Chemistry in 

 the Medical Cc'iege of the State of South Carolina. 



The mineral here described, I found upwards of two years 

 ago, while engaged in the geological survey of Connecticut. It 

 was collected in the town of Danbury near the manufactory of 

 Col. White, and occurred in small masses of a delicate bluish 

 white and highly crystalline feldspar, found among fragments of 

 dolomite, coming from a bed in place near the mills. The feld- 

 spai" 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 the town of Brookfield, — a 

 circumstance which leaves little room to doubt that the specimens 

 at Danbury, though found detached, were nevertheless derived 

 from the dolomite. 



The mineral believed to be new is observed disseminated in 

 small quantity through the feldspar (with which is likewise asso- 

 ciated a small quantity of qnartz) in fissures and cavities having 

 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 considerable quantity, 

 I am miable to say. The specimens collected, have been barely 

 sufficient to afford the following notice. 



Vol. XXXY.— No. 1. 18 



