Kunz — New Lilac-Colored Transparent Spodumene. 267 



?7i/\m = 93° 1^'. The angle irhA^in given bj Dana in liis System 

 of Mineralogy is 93° 0', and is based on measurements made 

 with a contact goniometer by Prof. J. D. Dana on a crystal 

 from Norwich, Mass." 



A prominent feature of these specimens, and also of hiddenite, 

 is the twinning about the a (100) face, and is beautifully shown 

 on the etched crystals where the etching proceeds to the twin- 

 ning plane and there makes a halt. Aside from differences in 

 color, the fragments of the mineral are remarkably like the 

 etched crystals of hiddenite from North Carolina. 



The locality brings to mind the famous locality ©f Branch- 

 ville. Conn., described by Brush and Dana, but there the gigantic 

 crystals were almost entirely altered to an opaque mineral. In 

 habit these crystals resemble the spodumene from ISTorth 

 Carolina, and for beauty, transparency and great size of perfect 

 material are not equalled by any known locality. 



If sufficient differences are found to exist between this 

 spodumene and the other known varieties a new name will be 

 given to it. 



40 E. 25th St., New York City. 



SCIENTIFIC INTELLIGENCE. 



Geology and Mineralogy. 



1. The Geology of Ascutney Mountain^ Yermont ; by R. A. 

 Daly, U. S. Geol. Survey, Bull No. 209, 120 pp., 7 pis.— Mount 

 Ascutney is a small eruptive mass having an unusually wide range 

 of composition including gabbros, diorites, essexites, "Wind- 

 sorite" — a new rock type — nordmarkite, porphyry, pulaskite, 

 paisanite, syenite with granitic and mouzonitic phases, biotite 

 granite, aplite, diabase, and caraptonites. The intrusion resulted 

 in the feldspathization of phyllitic country rock. The discussion 

 regarding the method of intrusion is of especial interest because 

 Ascutney is given as a concrete example of Dr. Daly's theory of 

 overhead stoping assimilation and differentiation recently explained 

 in this Journal (xv, 269; xvi, 107). 



2. Wisconsin Geological and Natural History Survey. — Two 

 volumes have recently been issued : Bulletin" No. 9. Pre- 

 liminarj^ Report on the Lead and Zinc Deposits of Southwestern 

 Wisconsin ; by U. S, Cea^t. 97 pp., 4 pis., 8 figs. A description 

 of the general geology of the zinc region is given, followed by a 



Am. Jour. Sci.— Fourth Series, Vol. XVI, No. 93.— September, 1903. 

 18- 



