4^ DESCRIPTIVE MINERALOGY. 



ADDITIONS. 



TERENITE. 



[From the Greek rspfv, tender ; a characteristic property of the mineral.] 

 Tcrenite. Emmons (New-York Geological Reports, 1837). 



Description. Colour yellowish white or pale yellowish green. It has a cleavage parallel 

 to the sides of a square prism, and in the direction of its diagonal. Lustre faint pearly. 

 Hardness 2.0. Specific gravity 2.53. Before the blowpipe, in the external flame, it is 

 instantly changed into a white enamel ; in the interior, it fuses readily with ebullition into a 

 porous glass. With nitrate of cobalt, this enamel becomes of a lively blue colour. 



Geological Situation. In white granular carbonate of lime, a primary rock. 



Jefferson County. This mineral has heretofore been found only in Antwerp, associated 

 with calcareous spar and foliated plumbago. All the information which I have in regard 

 to it, is that derived from the notice published by Dr. Emmons as above quoted. 



aUARTZ (Page 267). 



Fine specimens of calcedony and chrysoprase, associated with calcareous spar, have been 

 found at Belmont's lead mine, in St. Lawrence county {Emmons). 



BITUMEN (Page 182). 



Mr. Vanuxem states that he found petroleum in the septaria above the Tully limestone, 

 near Ogden's ferry on Cayuga lake. It was accompanied, likewise, by a liquid substance of 

 the colour of phosphate of iron or prussian blue, and by another substance like spermaceti 

 before the oil is fully pressed out. It was composed of fine scales, had a yellowish white 

 colour, was in small irregular masses, with the appearance of having been melted. Both of 

 these two last substances are new.* 



I regret that I can add nothing to the above notice of these singular products. 



"• Vanuxem. New-York Geological Reports, 1839. 



