CATALOGUE OF GEMS AND PRECIOUS STONES. 65 



Macon County — Continued. 



Brilliant, circular girdle; deep red; 0.718 carat; 6 by 3.5 mm. Isaac 



Lea collection No. 491 



Brilliant, circular girdle; brown-red; 0.567 carat; 5 by 3.5 mm. Isaac 



Lea collection No. 492 



GARNET, variety RHODOLITE. 



UNITED STATES. 



North Carolina. 



Step-brilliant, circular girdle; deep violet-red; two stones, 2.0 and 1.97 

 carats; each 7 by 5 mm. Isaac Lea collection No. 460 



GARNET, variety SPESSARTITE. 



UNITED STATES. 



Virginia. 



Amelia Courthouse, Amelia County: 



Brilliant, circular girdle; orange-brown; 40.115 carats; 21 by 13 mm No. 147 



Brilliant, circular girdle; orange-brown; 11.8 carats; 14 by 8 mm No. 152 



Step-brilliant, rectangular girdle; orange-brown; 12 by 11 by 8 mm. 



Gift of Ira R. Allen No. 154 



Step-brilliant, rectangular girdle; orange-brown; 9.0 carats; 12 by 10 



by 7 mm. Gift of Ira R. Allen No. 153 



Brilliant, circular girdle; orange-brown; 7.44 carats; 11.5 by 8 mm No. 148 



Cabochon, circular girdle; orange-brown; 5.797 carats; 11 by 5.5 mm. 



Isaac Lea collection No. 155 



Brilliant, circular girdle; orange-brown; 2.67 carats; 8 by 6 mm \. No. 150 



Brilliant, circular girdle; orange-brown; 2.49 carats; 8 by 5.5 mm No. 149 



Brilliant, circular girdle; orange-brown; 1.126 carats; 6 by 4 mm No. 151 



GOLD. 



Native gold, either in the form of leaf, nugget, or embedded in 

 quartz, is often used in the form of scarf or breast pins and is hence 

 recognized here by a characteristic form. It ranks, however, more 

 as a curiosity or souvenir than as a commercial article. 



LIST OF SPECIMENS. 



Leaf gold mounted as a breastpin. California. Isaac Lea collection No. 1779 



Graphic granite. — See under Miscellaneous on page 120. 

 Grossularite.— See under Garnet. 



GYPSUM. 



Synonyms or varieties. — Alabaster, satin spar, selenite. 

 Composition. — Hydrous calcium sulphate, CaS0 4 .2H 2 0. 

 Crystallization. — Monoclinic. 

 Color. — White or colorless. 



Luster. — Vitreous or silky in fibrous varieties; transparent to 

 translucent. 



Hardness. — 2; entirely too soft to be used as a precious stone. 

 Specific gravity.— -2.32 ± 0.05. 



