Sterretb — Tourmaline from San Diego County, Cat. 461 



termination when present is made irp of c\ r' and e' variously 

 developed. The crystals show considerable variation in length ; 

 as a rule they are slender and the prisms are generally striated. 

 No. 2 of the plate has been broken at the lower end and does 

 not show its full length ; while No. 3 and fig. 2 represent 

 doubly terminated crystals. The colors are transparent pink 

 or green throughout, or combinations of pink above and green 

 below. 



A second type is represented by figs. 3, 4 and 5, which are 

 especially interesting because of the development of the scaleno- 

 hedron t, and on some crystals a second scalenohedron x shows 

 slight development. The lower termination when present 

 generally consists of the basal plane and subordinate r\ as 

 shown in fig. 3. Most of the crystals are pink or rose color 

 throughout; some are dark enough to be classed as rubellite ; 

 occasionally they are light green at the lower end. Some of 

 the finest pink gems are cut from crystals of this type. 



It is very unusual to have tourmaline crystals terminated as 

 in fig. 5 by a large development of a scalenohedron. The brown 

 tourmaline from Gouverneur, N. Y., shows a similar develop- 



