250 ' Localities of Minerals. 



5. By Dr. W. Langstaff. 



1. Quartz, and a green substance which appears to be 

 aiigite or coccolite — found in gneiss near Cold-Spring 

 landing. 



2. Coccolite, in foliated hmestone ; same locality with 

 tlie zircon. 



3. Do. in quartz — same locality. 



fDo. in mass — same locality with the zircon. 

 J Augite, abundant in the the gneiss rocks at Cold- 

 \ Spring Landing. 

 [^Do. containing sphene. Cold-SpringLanding, N. J. 



5. Scapolite, containing Plumbago. Hamburgh. 



6. Brucite. Hamburgh. 



7. Black Mica, in augite. Cold-Spring. 



6. By J. P. Brace. 



In Southbury, the greenstone formation visible in Wood- 

 bury continues west of the meeting-house, between the 

 Pompanaug creek and the Housatonic — extending six or 

 seven miles in length, being composed of several ridges, in 

 all about a mile in breadth. The minerals connected with 

 this range are : — 



1. Chalcedony, resembhng that of Patterson, N. J. of a 

 beautiful blue — covered frequently by botryoidal concre- 

 tions of cac^o/onof. 



2. Amethyst. The crystals of this mineral are often quite 

 regular, with both terminations visible, and the coloring 

 matter more uniformly diffused than is common in the ame- 

 thyst of Woodbury, New-Haven and Patterson. Some 

 specimens which I saw in the cabinet of Dr. L. Smith were 

 very beautiful. 



3. Common Opal, of an inferior quality. 



4. Prehnite, occasionally. 



5. The agates of this range are in nodules, composed of 

 layers of blue and white chalcedony. These layers are, 

 principally, incrustations of a solid nucleus of quartz, and 

 are often quite handsome. 



6. Agatized Wood, in the south part of the town — found 

 by Dr. Smith. It presents distinct branches, with their 

 knots, bark and ligneous layers often visible, sometimes four 



