vo. 2348. MINERALS FROM TRUMBULL, CONNECTICUT— SHANNON. 481 



Analyses of maryarite. 



This composition approaches that of margarite, and although the 

 analysis differs from those of normal margarites in several respects, 

 chiefly in the lower water content, it is evidently a variety of that 

 mineral. 



Optical determinations upon the analyzed material were not en- 

 tirely satisfactory, the indices of refraction varying from grain to 

 grain. Under the microscope the material is in flat shreds of rec- 

 tangular outline. Most of these are optically negative, but some 

 appear to be optically positive. The final accepted figures for the 

 indices of refraction are as follows : 



0=1. 620±003 



/3=1. 629 ±003 



7=1. 630±003 



a-^= .010±003 



The analyzed material showed no margarodite under the micro- 

 scope, the latter mineral being readily distinguishable by its lower 

 index of refraction. 



Similar fibrous material occurs elsewhere in the quartz veins, 

 typical though iron stained blocks of some size being seen along the 

 borders of the quartz veins in the main pit. 



SCAPOLITE. 



Radiated scapolite occurs in quartz, intimately associated with 

 rose pink to purple fluorite, in blocks of material in the dump of the 

 upj^er mine. The scapolite is faintly brownish white in color and 

 has a somewhat wax-like luster. The aggregates are coarse to fine 

 columnar and are made up of elongated prismatic crystals from 1 to 

 5 millimeters in diameter, which sometimes reach 6 centimeters in 



1814C4-21— Pi'or.X.M.vol.oS 32 



