104 Moses — Mineralogical Notes. 



(5) Yesumanite from New Mexico. 



Mr. W. M. Lippitt sent to me a single crystal with square 

 cross section 5/8 inch on a side, which is apparently vesuvi- 

 anite. It was found near the surface in a low range of hills 

 near Bear Mountain, a little west of Pinos Altos, Grant Co., 

 New Mexico. It is corroded and dull, but with the hand 

 goniometer gives the angles of vesuvianite as closely as could 

 be expected. The form is the unit pyramid (111) with mere 

 suggestions of the prism. The specific gravity is low, 3*12. 



V . 



(6) Chrysoberyl Crystal from New York City. 



Mr. W. G. Levison submitted to me for measurement a 

 crystal of chrysoberyl which he found, in 1893, in the rock 

 taken from an excavation on 88th Street, near Amsterdam 

 Avenue. 



It is essentially the type of heart-shaped crystal with 

 prominent pyramid o (111) described by Cathrein* as occurring 

 at the emerald mines of Tokowaia, and is composed of two 

 individuals with the usual twinning plane p (031). It is 

 not tabular, the dimensions in the directions of the axes 

 d, b, b being approximately 8xl0Xl4: mm . In color it is 

 closely the green of the chrysoberyl from Haddam, Conn., and 

 Petersdorf, Moravia. 



The observed forms were : 



Domes and pinacoids. — a (100), striated and yielding double 

 images; b (010), dull; and i (011), large but very dull. 



Pyramids. — o (111), bright and prominent on both individ- 

 uals ; ?i (121), small and yielding only a shimmer; a? (515), 

 doubtful, yielding a faint image between o and o"\ but as o 

 and o'" nearly coincide, it may be n" f of the second individual, 

 which has essentially the same position. 



Prisms. — s (120), bright and prominent, and m (110), occur- 

 ring only, as indicated in the figure, in the deep striations of 

 the faces a. 



Angle. 



Measured. 



Calculated. 



Error. 



00'" 



40° 11' 



40° 7' 



+ 4' 



ba 



90 4 



90 



+ 4 



bo 



70 01 



69 56 



+ 5 



bn 



53 58 



53 51 



+ 7 



bs 



4ft 52 



46 46 



-6 



bin 



64 57 



64 50 



+ 7 



bi 



60 16 



59 53 



+ 23 



OS 



39 47 



39 57 



— 10 



ox 



16 03 



15 53 



4 10 



* Zeitschr. f. Kryst., vi, 259, especially fig. 4. 



