CATALOGUE OF GEMS AND PRECIOUS STONES. 19 



CALCITE and ARAGONITE. 



Calcium carbonate occurs in nature under a great variety of forms 

 which are mainly quite unsuited for gem purposes, though widely 

 used in ornamentation (see under Coral and Supplemental Collec- 

 tions). Occasional forms are cut as souvenirs or as of local interest. 

 A few such are here included. 



LIST OF SPECIMENS. 



SPAIN (ROCK OF GIBRALTAR.) 



Polished plate of stalagmitic calcite; elliptical girdle; banded light and dark 

 brown; 48.2 carats; 38 by 30 by 5 mm. Gift of Rev. Alexander McDonald. No. 368 



UNITED STATES. 



California. 

 Colusa County: 



Cabochon, rectangular girdle, of aragonite; light and dark brown; 22.08 

 carats; 27 by 14 by 7 mm No. 369 



WEST INDIES. 



Cameo, "Departure of the hunter"; elliptical girdle; white on light brown 

 base; 49 by 39 mm (fig. ]) No. 1506 



Cameo, "Winged angel"; elliptical girdle; white on light brown base; 45 by 

 37 mm No. 1503 



Cameo, " Return of the hunter " ; 

 elliptical girdle; white on 

 lightbrownbase;42by36mm. No. 1504 



Cameo, head of Jupiter; ellip- 

 tical girdle; white on light m *^™ 

 brown base; 35 by 30 mm. .. No. 1505 B *A I ^dtv 



Cameo, kneeling child with 



cross; elliptical girdle; white 9k^ 



on light brown base; 31 by 24 V| ' wf i 



mm No. 1502 1^ mf4 



Three cameos, carved heads, 

 two representing bacchantes 

 and one Flora; white; oval 

 girdles; 36 by 22, 20 by 17, 19 Fig. l.— Shell cameo. 



by 16 mm No. 1501 



Conch shell with cameo carving, white and pink No. 1510 



Conch shell bracelet in form of a serpent; white and pink No. 1512 



Conch shell brooch, carved cupid; pink No. 1511 



Conch shell brooch; fish; brown and white No. 1509 



LOCALITY NOT RECORDED 

 Cameo, two faces; rectangular; white on light brown base No. 1519 



Californite. — See under Yesuvianite. 



Cameo. — See under Calcite and Aragonite (shell cameo), and 

 Quartz, variety Onyx. 



Carnelian. — See under Chalcedony. 



Catalinite. — -See under Quartz. 



Cat's-eye. — See under Chrysoberyl and Quartz. 



