1886.] NEW YORK ACADEMY OF SCIENCES. 265 



Dr. E. S. F. Arnold exhibited a cluster of flattened crystals 

 of quartz from the Hot Springs of Arkansas. 



Mr. George F. Kunz presented the following description 

 and illustration of the large garnet which was exhibited at the 

 meeting of December 7, 1885. 



The finest large garnet crystal ever found, perhaps, in the 

 United States, was discovered, strange though it may seem, in the 

 midst of the solidly-built portion of New York City. It was 

 brought to light by a laborer excavating for a sewer in West 35th 

 Street, between Broadway and Seventh Avenue, in August, 1885. 

 A quartzite vein, traversing the gneiss, contained the crystal. 

 The laborer took it to Mr. J. J. King, from whom I received it. 



The accompanying plate, engraved by our fellow-member and 

 mineralogist, Mr. B. B. Chamberlin, is a faithful representa- 

 tion of this interesting garnet. 



In form the crystal is a combination of the 2-2 tetragonal 

 trisoctaliedron (trapezohedron), the predominating form, and I- 

 dodecahedron, and 3-f hexoctahedron. 



It weighs nine pounds ten ounces (4.4 kilos), and mea- 

 sures fifteen cm. (six inches) in its greatest diameter, and six 

 cm. on its largest trapezohedral face. 



Twenty of the trapezohedral faces of the crystal are perfect,, 

 while the remaining faces were obliterated in the formation of 

 the crystal by pressure against the quartzite matrix. 



On the surface the color is a reddish- brown, with an occasional 

 small patch of what is apparently chlorite, which greatly enhances 

 its beauty. On a fractured surface, however, the color is a light 

 almandine, and the material in the interior of the crystal is 

 found to be very compact. 



This " find " is of peculiar interest, because within the past few 

 years large garnets have been brought to light at other localities 

 in this country, notably at Salides, Col.,' where large almandine 

 crystals occur, which are very perfect, and are coated with a 

 chloritic schist, readily removed by an acid, leaiing the garnet 

 with clean surfaces, though not smooth. Crystals weighing from 

 five to ten pounds, and one weighing fourteen pounds, have come 

 to the writer's notice. They are in a chloritic schist which 

 ' Vol. xxxiv., A. A. A. S., 1885, meeting, p; 241. 



