CATALOGUE OF GEMS AND PRECIOUS STONES. 113 



Paris, Oxford County — Continued. 



Brilliant, square girdle; pale violet-blue; 1.23 carats; by 5 mm No. 1142 



Brilliant, circular girdle; pale pink; 1.104 carats; 6.5 by 4 mm No. 1159 



Step-brilliant, rectangular girdle; very pale blue; 1.095 carats; 6.5 by 



5.5 by 5 mm No. 1143 



Step-brilliant, rectangular girdle; colorless; 1.06 carats; 8 by 5.5 by 3 



mm No. 1160 



Step, rectangular girdle; deep blue; 1.014 carats; 8 bv 6 by 3 mm No. 1140 



Step, square girdle; deep green; 0.952 carat; 6 by 3 mm No. 1161 



Step-brilliant, rectangular girdle; colorless; 0.84 carat; 6 by 5 by 4 mm. No. 1162 



Step-brilliant, rectangular girdle; colorless; 0.839 carat; 8 by 5 by 3 mm. No. 1163 



Step-brilliant, triangular girdle; green-yellow; 0.745 carat; 5 by 3.5 mm. No. 1156 



Step-brilliant, rectangular girdle; colorless; 0.726 carat; 7 by 5 by 3 mm. No. 1164 



Brilliant, circular girdle; deep green-blue; 0.672 carat; 6 by 4 mm No. 1153 



Step, square girdle; deep green; 0.657 carat; 5.5 by 3 mm No. 1165 



Step, rectangular girdle; deep blue; 0.65 carat; 6.5 by 5 by 2.5 mm. . . . No. 1152 

 Step-brilliant, rectangular girdle; very pale pink, almost colorless ; 0.636 



carat; 6.5 by 4.5 by 3 mm No. 1166 



Brilliant, rectangular girdle; pale green; 0.627 carat; 5.5 by 5 by 4 mm. No. 1154 



Step, rectangular girdle; deep green; 0.607 carat; 6 by 5 by 3 mm No. 1155 



Step-brilliant, elliptical girdle; yellow-green; 0.555 carat; 6 by 5 by 3 



mm No. 1167 



Brilliant, rectangular girdle; black, opaque; 0.55 carat; 6 by 4 by 3 mm. No 1144 

 Brilliant, circular girdle; pale yellow-green; 0.54 carat; 5 by 4 mm. 



Isaac Lea collection No. 1132 



Brilliant, circular girdle; pale green; 0.5333 carat; 6 by 3.5 mm No. 1168 



Step, square girdle; deep green; 0.515 carat; 5 by 3 mm No. 1157 



Step, rectangular girdle; pale green; 0.5 carat; 6 by 4 by 2.5 mm No. 1169 



Brilliant, circular girdle; colorless; 0.41 carat; 4.5 by 4 mm No. 1170 



Step, rectangular girdle; pale blue-green; 0.388 carat; 7 by 3 by 2 mm. No. 1171 



New York. 

 De Kalb, St. Lawrence County: 



Step-brilliant, rectangular girdle; pale yellow; 5.68 carats; 11.5 by 8 by 



6 mm No. 1106 



Macomb, Essex County: 



Two gems, brilliant, circular girdle; brown; 1.21 and 0.87 carats; 7 by 



5 mm. and 6 by 4 mm No. 1107 



LOCALITY NOT RECORDED. 

 Trap, rectangular girdle; dull violet-red; 2.72 carats; 10 by 8 by 4 mm No. 1177 



TURQUOISE. 



Composition. — Copper aluminum hydrous phosphate, CuAl 6 (P0 4 ) 4 + 

 9H 2 0. 



Crystallization. — Triclinic; distinct crystals rare, the mineral being 

 almost always crypto-crystalline. 



Color. — Blue, owing to the copper present. 



Luster. — Vitreous; translucent to opaque. 



Hardness. — 6; not very durable. 



Specific gravity. — 2. 70 ±0.10. 



Because of its crypto-crystalline character, turquoise will absorb 

 grease and oils readily, and it is not, therefore, absolutely satisfactory 



