MINERALOGY. 



213 



tal open, when the mica is seen to he so 

 arranged that the plates are parallel to 

 the length of the crystal. In such speci- 

 mens it seems as if the tourmaline had 

 either crystallized after the mica and so 

 had included some of it within itself or 

 that both had crystallized at the same in- 

 stant. The inclusion of the tourmaline 

 in the feldspar spoken of before admits 

 of the same inferences. 



Usually this mineral is found in indi- 

 vidual crystals of varying size, but it 

 sometimes occurs in aggregates of crys- 

 tals which radiate from a common center 

 forming the so-called radiating tourma- 

 line. Both the brown and the black are 

 found exhibiting this arrangement. 



As to distribution, tourmaline may be 

 found in almost any part of the Bronx, 

 though the brown seems to be limited to 

 the limestone formation at Kingsbridge, 

 for despite the fact that I have examined 

 much limestone in other parts of the 

 Bronx I have never been able to find it. 

 The black, however, is much more com- 



BLACK TOURMALINE FOUND IN XEW YORK 

 CITY BY MR. WILLIAM XIVEN AND 

 NOW ON EXHIBITION IN THE AMERI- 

 CAN MUSEUM OF NATURAL HIS- 

 TORY. 



mon and can be found associated with all 

 the rock formations of the Bronx except 

 the Inwood limestone in which I have 

 never found it. The best places to look 

 for tourmaline are in those excavations 



in which a pegmatite dike has been cut 

 through, and as these are found extend- 

 ing through the rock formation almost 

 everywhere in the Bronx, the distribu- 

 tion of the mineral is naturally very wide. 

 Some of the exact localities at which it 

 has been found are the following: Clin- 

 ton Ave. and 180th St. ; Webster Ave. 

 near Wendover Ave., radiating black 

 tourmaline; Westchester Ave. near the 

 Bronx River, very fine specimens ; Morris 

 Park Ave. and White Plains Road and 

 at other points along this avenue ; at the 

 entrance to Bronx Park on Crotona Ave. ; 

 in a rock dump at Southern Boulevard 

 and 173rd St. These are only a few of 

 the many places at which this mineral 

 has been found. 



If one is interested in the collection 

 of minerals, the present is the time to 

 collect in this Borough. While the 

 rapid building up of this section makes 

 it now a good collecting ground, yet it 

 will ultimately render the gathering of 

 minerals and other natural objects as 

 difficult as it is in the Borough of Man- 

 hattan. 



Note. — Some years ago I found a needle 

 crystal of transparent green tourmaline in pure 

 white limestone and also a part of a crystal not 

 quite as large in circumference as a lead pencil, 

 nf green tourmaline with a pink center, at 

 Kingsbridge Ship Canal. — Editor. 



Minerals of New Hampshire. 



BY MISS KATE A. JONES, GRANTHAM, NEW 

 HAMPSHIRE. 



Grantham, New Hampshire, and ad- 

 joining towns are quite rich in geological 

 specimens which are found not only on 

 the mountains but in the granite ledges 

 which stretch for miles along the base of 

 the hills. 



During one of my walks I found fine 

 soecimens of quartz crystals in chalced- 

 ony while in the steeo sides of the 

 ledges were pockets lined with sparkling 

 crystals. Among these one finds smoky 

 quartz and the yellow or topaz crystals ; 

 others show delicate tints of amethyst, 

 red and green. 



A friend recently found some pockets 

 filled with small, needle-like crystals, 

 clear and perfect. Other cavities con- 

 tained garnets ; from one of these he 

 gathered one hundred garnets of various 

 sizes. 



