CATALOGUE OF GEMS AND PRECIOUS STONES. 101 



rocks, generally gneiss or mica schist, in veins of kaolin. The asso- 

 ciated minerals are quartz, mica, rutile, beryl, and feldspar. 



Kunzitc is a pale pink to amethystine variety discovered within 

 the past few years in the pegmatite dikes near Pala, San Diego 

 County, California. It affords very handsome, delicately tinted 

 stones. (See pegmatite collection in the geological hall.) 



Most of the gem spodumene other than that mentioned above 

 comes from the province of Minas Geraes, Brazil, where it occurs 

 rather abundantly in crystals closely resembling chrvsoberyl in color. 



LIST OF SPECIMENS. 



SPODUMENE, common. 



BRAZIL. 



Brilliant, circular girdle; pale yellow; 0.97 carat; 6.5 by 4 mm No. 252 



Brilliant, rectangular girdle; pale yellow; 0.735 carat; 6.5 by 5.5 by 3 mm.. No. 253 

 Brilliant, circular girdle; green-yellow; 0.315 carat; 4.5 by 3 mm No. 254 



SPODUMENE, variety HIDDENITE. 



UNITED STATES. 



North Carolina. 



Stony Point, Alexander County: 



Brilliant, circular girdle; streaked deep and pale green; 0.7 carat; 6 by 



3.5 mm. Isaac Lea collection No. 255 



Step, rectangular girdle; pale yellow-green; 0.678 carat; 5.5 by 5 by 3.5 



mm No. 258 



Step, rectangular girdle; pale yellow-green; 0.585 carat; 7 by 4 by 3 mm. No. 260 

 Step, rectangular girdle; pale green-yellow; 0.535 carat; 5.5 by 5 by 3 mm. No. 259 

 Brilliant, square girdle; pale yellow-green; 0.466 carat; 5 by 3 mm .... No. 261 

 Brilliant, rectangular girdle; green; 0.373 carat; 5.5 by 4 by 2.5 mm. 



Isaac Lea collection No. 256 



Step, rectangular girdle; green; 0.224 carat; 4 by 3.5 by 2 mm. Isaac 



Lea collection No. 257 



SPODUMENE, variety KUNZITE. 



California. 

 Pala, San Diego County: 



Step, elongated octagon girdle; very pale pink; 7.19 carats; 12 by 10 by 



8 mm No. 1566 



Step-brilliant, circular girdle; pale pink; 7.137 carats; 12 by 7.5 mm. 

 Isaac Lea collection No. 1030 



STAUROLITE. 



Synonyms. — Cross-stone, fairy-stone. 



Composition. — Iron aluminum hydroxy silicate, FeAl 5 (OH) (Si0 6 ) 2 . 

 Crystallisation. — Orthorhombic.hubit prismatic; frequently twinned 

 in cross or star-like forms. 



Color. — Brown, due to the iron present; slightly plcochroic. 

 Luster. — Vitreous; translucent to opaque. 



