394 F. A. Genth — Contributions to Mineralogy : 



stopping the water-current. If, at starting, the excess of 

 mercury remaining in A and the tubes connected with it is so 

 great that the water-pressure cannot lift it out of the tube H, 

 it will be necessary to disconnect the rubber tube M and force 

 out the excess of mercury at this point by means of "the usual 

 stream of water. 



The mercury delivered into the Sprengel-tube may carry 

 traces of water with it, particularly when there is water in the 

 reservoir C and when, at the same time, mercury is allowed to 

 run through the pump faster than the elevator is raising it, so 

 that the mercury-level sinks to a low point in the tube I. In 

 this case water-vapor can be guarded against by j)lacing con- 

 centrated sulphuric acid in C. 



Sheffield Laboratory. New Haven. Conn., March, 1891. 



Art. XLY. — Contributions to Mineralogy, No. SO; by F. 

 A. Genth ; with Crystal! ograj>hic Notes by S. L. Penfield 

 and L. V. Pikssox. 



1. Ox Three Xew Varieties of Axixite. 

 a. Axinite from Franklin, New Jersey. 



The specimens for examination were received from Messrs. 

 Geo. L. English & Co. The axinite, both, in crystals and 

 laminated masses, is found, as a great rarity, associated with a 

 beautiful rose-colored variety of fowlerite, polyadelphite, bio- 

 tit e and barite. The crystals are of a beautiful honey-yellow or 

 pale greenish yellow color, from about l mm to 5 mm in size. Spec, 

 grav. of the crystals = 3 "358, of the laminated masses = 3*306. 



The axinite crystals are of interest as they have a very un- 

 usual habit and also possess some rare planes. 



The forms which have been observed are as follows, using 

 Naumann's position. 



a, 100, i-i m. 110, T as, 111, —V s, 201, -2-1 X, 021, 2-i 

 &, 010, i-i M, 110, / r, 111, -1 W, 312, -f-3' V, 112, £ 



As seen in figure I the crystals are tabular from an unusual 

 development of the x faces, giving a habit unlike anything 

 which the authors are familiar with in this species. The face 

 W, 312, is well developed and is new. It was readily deter- 

 mined by r measurement and its occurrence in the zone 

 M s x. V, 112, is a rare form which is not given by Gold- 

 schmidt* or Frazierf in their lists of axinite planes. It is 



* Index der Krystallformen. f This Journal, III, xxiv, p. 439. 



