202 Brush and Dana — Mineral Locality at Branchville. 



the years of 1878 and 1879, we carried on a somewhat extended 

 search for these minerals in the ledge from which they had 

 been obtained, but the spot from which the most interesting 

 specimens had been derived was very unfavorably situated for 

 work, being ten feet or more below the level of the ground, and 

 our efforts were only in part successful. Some of the results 

 we have already announced in subsequent papers. 



Perhaps the most important result of our early explorations 

 was to prove the presence of large amounts of potash feldspar 

 (microcline) and quartz in the vein — in fact, before we ceased 

 our private work, we had brought to the surface several hun- 

 dred tons of these minerals. This material was of so excellent 

 quality for technical use and the supply seemed to be so large 

 that negotiations were presently entered into between Mr. 

 Fillow, the owner of the property, and the Messrs. Smith, of the 

 Union Porcelain Works, of Greenpoint, New York, with the 

 ILnal result of the sale of the property to the latter gentlemen. 

 This was accomplished in 1880. Since that time the work of 

 quarrying for feldspar and quartz has been carried forward 

 uninterruptedly and with gratifying success; up to the present 

 time Mr. Fillow informs us that from three to four thousand 

 tons of feldspar and four thousand tons of quartz have been 

 ■shipped from the locality. The arrangement has proved also 

 a very successful one from a scientific point of view. The 

 Messrs. Smith have very liberally placed at our disposal all the 

 material obtained from the locality which was of no technical 

 value, while the daily presence of Mr. Fillow, with his active 

 interest and keen eye, has resulted in saving for science prac- 

 tically everything which the locality has yielded. The cov- 

 ering of earth was early removed, and the ledge opened to as 

 great a depth as the drainage would allow; since then the 

 drain has been repeatedly cut deeper until in the summer of 

 1888, ten years after our first work, the time to which we had 

 been constantly looking forward arrived and the deep spot 

 from which the first supply of phosphates came was reached.* 



In the meantime, however, the work had not been unpro- 

 ductive, and the contents of our third paper upon certain 

 deposits of lithiophilite, eosphorite and other associated min- 

 erals, and of our fourth paper upon the spodumene and its 



Redding it 'e : (MD,Fe) 3 P0 4 + BH 2 ; in pinkish orthorhombic crystals near scoro- 

 'dite in form, also in granular masses. + 



Fairfieldite: a phosphate of manganese and calcium (Ca,Mnj 3 P 2 8 + 2H 2 0; 

 triclinic, usually in foliated masses, of a white or yellowish color and pearly to 

 adamantine luster. 



Fillowite: a phosphate of manganese, iron, calcium and sodium; in granular 

 aggregates of monoclinic crystals of a honey-yellow color and resinous to ada- 

 mantine luster. 



* It may be added that at present the depth of the opening is some 40 feet and 

 is length and breadth about 160 by 45 feet. 



