CATALOGUE OF GEMS AND PRECIOUS STONES. 17 



Step-brilliant, elliptical girdle; pale green; 1.737 carats; 10 by 7 by 4 mm. 



Isaac Lea collection Xo. 722 



Brilliant, circular girdle; pale green; 1.265 carats; 7 by 4 mm Xo. 728 



Step-brilliant, elliptical girdle; pale green; 1.25 carats; 9 by 7 by 4 mm. 



Isaac Lea collection Xo. 72 4 



Step-brilliant, elliptical girdle; pale green; 1.18 carats; 9 by 7 by 3.5 mm. 



Isaac Lea collection Xo. 723 



Brilliant, circular girdle; pale green; 1.159 carats; 7 by 4 mm. Isaac Lea 



collection No. 726 



Step-brilliant, rectangular girdle; 0.915 carat; 7 by 5 by 3 mm No. 730 



Step-brilliant, elliptical girdle; 0.907 carat; 10 by 6 by 3 mm. Isaac Lea 



collection No. 725 



Brilliant, circular girdle; pale green; 0.838 carat; 7 by 4 mm Xo. 729 



Step-brilliant, elliptical girdle; blue-green; 0.26 carat; 6 by 4 by 2 mm Xo. 731 



BERYL, variety EMERALD. 



UNITED STATES. 



North Carolina. 



Cabochon of emerald matrix, elliptical girdle; green and white mottled; 



3.1 carats; 12 by 8 by 5 mm. Gift of Passmore Gem Company Xo. 1650 



Mitchell County: 



Cabochon of emerald matrix, elliptical girdle; green and white mot- 

 tled; 38.15 carats; 28 by 21 by 9 mm Xo. 1574 



Stony Point, Alexander County: 



Twenty-five small gems, step, square and rectangular girdles; one step- 

 brilliant, circular girdle; bright green; total weight 5.96 carats; aver- 

 age size, 4 by 3.5 by 3 mm. Isaac Lea collection No. 801 



LOCALITY NOT RECORDED. 



Step, elliptical girdle; pale green; 12 by 11 by 7 mm. Set in a ring No. 828 



Step, rectangular girdle; green; 12 by 10 by 6 mm. Set in a ring No. 829 



Table, rectangular girdle; deep green; 1.405 carats; 8 by 6 by 4 mm No. 794 



Step-brilliant, elliptical girdle; green; 0.697 carat; 6.5 by 6 by 3 mm No. 795 



Step, rectangular girdle; green; 0.52 carat; 6 by 5 by 3 mm No. 796 



Polished pebble, pear-shaped girdle; green; 4.87 carats; 14 by 7 mm No. 797 



Three small stones, step-brilliant, one irregular, one rectangular, one square 

 girdle; green; total weight, 0.4 carat " Nos. 798 to 800 



BERYLLONITE. 



Composition. — Sodium beryllium, phosphate, NaBeP0 4 . 



Crystallization. — Orthorhombic. 



Color. — Colorless. 



Luster. — Vitreous; transparent. 



Hardness. — 6; not very durable. 



Specific gravity. — 2. 85 ±0.05. 



Optical properties. — Mean refractive index, 1.56; double refraction 

 moderate, 0.01; optically biaxial, negative. 



The mineral can be distinguished with certainty from other precious 

 stones which resemble it only by chemical tests. It occurs in pegma- 

 tite, like bend and tourmaline, and was first discovered among the 



4555—22 3 



