SUPPLEMENT TO MINERAL LEXICON. 



757 



1892. CuMMiNGTONiTE. Amphiljole-Autliophyllite, Irou-Magnesium, Ainplii- 

 bole. Cuiuining-tou. Sp. gr. ^ 3.1 to 3.32. 



E. S. Daua. Sys. Min.. pp. 390,395. Cites above analyses. 



1895. Datolite. Northampton. 



Delauey's quarry, on railroad near nortli line of Holyoke, in Triassic diabase. 

 Discovered by Rev. J. Prevost. In a crushed zone in the diabase embedded in 

 calcite. Very fine crystals of most brilliant luster, the largest nearly a half 

 inch across, and with the slightly green tint which is common in the Bergen 

 crystals, but here a little more yellow than there. The forms are of a type new 

 in the valley, resembling fig. 1, with the addition of the base, or fig. 4, page 503, 

 of Dana's Sys. Min., 1892, but with f and /< greatly increased at the expense of m 

 andw,; c is a large composite face. The forms present are » P (110), .J P (Il2), 

 O P (001), ^ P CTJ (100), § P cfc (023), P db (Oil), ^ P (Il3), — P (111), | P oo 

 (102), — 2 P 2 (121), —J P c?. (102), i P cfc (013), oo P co (010), the la.st four small. 

 Specimens in the Smith and Amherst College cabinets. (See p. 470.) 



1895. Datolite var. Botryolite. Greenfield. 



At Cheapside, in a new road cut through the trap; in white globular masses 

 in steam holes in red trap. (See p. 443.) 



1895. Enstatite. Granville. 



The mineral, in large, square, colorless prisms from the large bed at Downey's 

 (see p. 90), has been analyzed by Mr. W. F. Hillebrand, with the following lesult: 



Analysis of enstatite from Oranville. 



