CATALOGUE OF GEMS AND PEECIOUS STONES. 93 



Stoneham, Oxford County: 



Step-brilliant, square girdle; deep smoky brown; 62.977 carats; 27 by 14 



mm No. 1338 



North Carolina. 



Mount Pisgah, Alexander County: 



Brilliant, elliptical girdle; very pale smoky brown, almost colorless; 



543.38 carats; 68 by 51 by 25 mm. Isaac Lea collection No. 1339 



Spring Mountain, Iredell County: 



Brilliant, elliptical girdle; pale smoky brown; 284.09 carats; 55 by 42 



by 20 mm. Isaac Lea collection No. 1340 



Virginia. 

 Fairfax, Fairfax County: 



Three gems, brilliant, elliptical and rectangular girdles ; smoky brown; 

 8.16, 5.58, and 2.87 carats; 16 by 13 by 7, 15 by 10 by 6, and 11 by 

 8 by 5 mm No. 1341 



LOCALITY NOT RECORDED. 



Brilliant, rectangular girdle; smoky brown; 241.73 carats; 49 by 35 by 22 



mm. Isaac Lea collection No. 1351 



Step-brilliant, elliptical girdle; smoky brown; 83.22 carats; 35 by 28 by 14 



mm No. 1353 



Step-brilliant, square girdle; pale brown; 53.58 carats; 25 by 14 mm. Isaac 



Lea collection -. No. 1352 



Step-brilliant, elliptical girdle; smoky brown; 41.8 carats; 28 by 19 by 12 



mm No. 1354 



Tetragonal prism; smoky brown; 24.68 carats; 24 by 11 mm No. 1349 



Two cuff buttons, circular girdle; smoky brown; 20 carats each; 19 mm. 



diameter No. 1350 



Step-brilliant, rectangular girdle; smoky brown; 13.1 carats; 19 by 16 by 



6 mm. Isaac Lea collection No. 1357 



Two gems, step-brilliant, elongated octagonal girdle; very pale smoky 



brown; 5.57 and 3.25 carats; 12 by 10 by 7 and 12.5 by 9 by 4 mm. Isaac 



Lea collection No. 1358 



Step-brilliant, elliptical girdle; pale smoky brown; 4.95 carats; 14 by 11 by 



5 mm. Isaac Lea collection No. 1359 



Step-brilliant, rectangular girdle; pale smoky brown; 3.57 carats; 12 by 



9.5 by 5 mm No. 1356 



Three gems, step-brilliant, elliptical girdle; smoky yellow-brown; 11.25, 



6.61, and 3.81 carats; 17 by 14 by 9, 14 by 11.5 by 7, and 12 by 10 by 6 mm. No. 1355 



Rhodolite. See under Garnet. 



RHODONITE. 



Composition. — Manganese metasilicate, MnSi0 3 . 

 Crystallization. — Triclinic. 



Color. — Pink, characteristic of manganese compounds. 

 Luster. — Vitreous; translucent. 

 Hardness. — 6; not very durable. 

 Specific gravity. — 3.50 ±0.10. 



Optical properties. — Mean refractive index, 1.73; double refraction 

 moderate, 0.01; optically biaxial, negative. 



