56 Chemical Examination of American Minerals. 



96-193 



D'Ohsson likewise found 0-86 per cent, of potash. This 

 induced me to search for it three several times, but without 

 success. Hence I am sati>fied that if any exist in the pure 

 mineral, the quantity must be very minute. 



It is obvious that chondrodite is a compound of, 

 1 atom fluate (if magnesia, 

 6 atoms silicate of magnesia. 



The iron and the water are probably accidental constitu- 

 ents. The potash was probably derived from some inter- 

 spersed foreign mineral, which did not exist in my specimens. 



Note. This mineral, which occurs abnnrlantly in New- 

 Jersey, New-York, and Massachusetts, was first noticed by 

 the late Dr. Bruce in the year Ibli. He observed it in a 

 crystalized carbonate of lime, brought from Sussex County, 

 New Jersey, and supposed it to be an ore of titanium. A 

 notice of it appeared in the American Mineralogical Journal, 

 p. 239. Some specimens were sent by Dr. Bruce to Haiy, 

 who placed it in his cabinet, where it remained for many years 

 unexamined, till Berzelius, in a visit to Paris, recognized it 

 to be the Chondrodite. 



Soon after the mineral was sent over to Europe, Dr. Lang- 

 staff, then a pupil of Dr. Bruce, undertook its analysis, and 

 ascertained its ingredients to be silica, magnesia, and fluoric 

 acid. He repeatedly analyzed the mineral as early as the year 



