218 



W. E. Ford — Interesting Beryl Crystals. 



prominent development of the pyramid of the second order s 

 (1121), give them a habit of crystallization very different from 

 that usually shown by beryl. The crystal represented by fig- 

 ure 2 also shows smaller replacements by faces of the pyramid 

 of the first order p (1011) with an occasional face of the 

 dihexagonal pyramid v (2131). It is further complicated by 

 several reentrant angles caused by a repetition of the faces 

 due to parallel growth. The figures are drawn to show as 

 nearly as possible the development of the faces in their true 

 proportions, figure 1 being about natural size while figures 2 

 and 3 are one half natural size. The crystals are transparent 

 and of a beautiful light rose-pink color : their extraordinary 

 color combined with their unusual habit of crystallization 



m 



m 



m 



make them especially noteworthy. Figure lis of a crystal loaned 

 for study by Mr. Ernest Schernikow of New York and which has 

 since come into the possession of the Brush Collection, while the 

 crystals represented by figures 2 and 3 are in the Tiffany Gem 

 Collection in the American Museum of Natural History, New 

 York. 



Figures 4, 5 and 6 are of beryl crystals showing interesting 

 similarities in habit and association with those just described, 

 but from other localities. Figure 4 represents an incomplete 

 crystal found at Mt. Mica, Paris, Maine, now in the mineral 

 collection of the American Museum of Natural History in 

 New York. It shows a short development of the prism m 

 with prominent faces of the second order pyramid s; also 

 small replacements of another pyramid of the second order o 

 (1122), of the pyramid of the first order p, and of the dihexag- 

 onal pyramid v (2131). The crystal is transparent and color- 

 less like pure quartz, and attached to it are plates of lepidolite. 

 Figure 5 is likewise of a colorless crystal from Mt. Mica 

 belonging to the Brush Collection, nearly complete, quite 

 symmetrical in development and about 15 mm in diameter. It 

 is characterized by small faces of the prism m and a large 

 development of the pyramid s, while o and v were observed as 



