254 W. K Hidden — Miner alogical Notes. 



periphery, the striae being distant at the apex, becoming broader 

 and close at the periphery. These are crossed by concentric 

 striae which are about equally distant towards the apex, but 

 close at the periphery; the result is a cancellated appearance 

 towards the apex which disappears towards the base. 26. Diam- 

 eter 7*3 mm , elevation 3*9' um , spire very low, whorls 5, umbilicus 

 small, open. The outer and inner lips seem to be joined over the 

 body by a V-shaped lamina, of which all of the lower but only a 

 portion of the upper part is preserved in the specimen. 27. Only 

 the five upper whorls are preserved. 



Art. XXXVIIL— Mineralogical Notes ; by W. E. Hidden. 



Transparent Xenotime, from Alexander County, North 

 Carolina. 



At a locality about one mile southeast of Sulphur Springs, 

 an outcropping of quartz was investigated and a "pocket" of 

 beautiful crystals was opened up. As there was much musco- 

 vite associated with the quartz crystals, and in a very disinte- 

 grated condition, the whole vein matter was hauled to water 

 and washed after the manner of gold washing, that is to say, 

 in a "rocker." The final concentrates proved to be rich in 

 brilliantly clear monazite and to contain a few small crystals of 

 clear, bright xenotime. The best of these, which were unfortu- 

 nately the very smallest, were sent to Prof. Penfield for careful 

 measurement of their angles. He states his results as follows: 

 The xenotime crystals gave very good inflections but showed 

 some variation in angles. The best crystal gave the following : 



North Carolina. , Dana's 6th. Edition. 

 Measured. Calculated. 



z\z", 111 ~ 111 =82° 18' 82° 22' 



a a z', Ill a 111 =55 26+ 55 30 



He also measured z^z" = 82° W and 82° 21f on two other 

 crystals. 



It is thus seen that the measurements of these new crystals 

 do not vary essentially from those of vom Rath and Klein 

 quoted by Dana. They present the prism m, 110, in combi- 

 nation with the pyramid z, 111, and a steeper pyramid which 

 is probably u, 331 ; like figures 3 and 4 on p. 483 of Dana's 

 Mineralogy, sixth edition. The color of the crystals was clear 

 yellow-brown. The largest one was only 3 X 11 mm., while 

 those measured were only about 1x2 mm. A distinctly 

 twisted gyroidal-like development was positively noticed in 

 the larger crystals. It was impossible to obtain enough of 

 these rare crystals for even an approximate analysis. 



