SPECIFIC GRAVITY OF GEMS. 



405 



known, to give less accurate results. The temperature at the time 

 of the determination is given in all cases and the results are 

 corrected to 4° C, according to Rosetti's determinations of the 

 density of water. The extremes of specific gravity, as given by 

 F. W. Clarke in his "Constants of Nature,'" are added. The 

 numerals refer to my catalogue of specimens, and are added in case 

 of future reference. 



TABLE OF SPECIFIC GRAVITIES. 



Locality. 



Beryl (beiyllium silico alumi- 



nate) — 

 Beryl, pale green 



" " (5 small stones) 



(F. W. Clarke gives a range from 

 2-6o0 to 2 72.5) 



CHRYsoBKRvr. (ber) lllum alnmi- 



nate) — 

 Cymophaiie or cat.-eye [3 small 

 stones) 



" (4 small 



stones) 

 (F. W. Clarke gives a range irom 

 3-597 to 3-86'i) 



Chrysolite (magnesium, iron 



silicate) - 

 Chrysolite 



CoRUNDUAi (alumina) — 



Adamantine spa*- 



Ba' klyite (4 uncut stones) 

 Ruby 



(6 small stones) 

 star 



ed siE 



(F. W. Clarke gives a range fiom 

 3-511 to 3-994) 



Sapphir ', pale blue 



" rovalblue 



Ceylon 



N.S. Wales 

 Ceylon 



(4 specimens) dark 

 colored 



pale blue 



tUow, large " Oriental 

 topaz " 



Ceylon 



20 C. 



20 C. 

 21-5 C. 

 21-5 C. 



19 C. 



21 C. 

 21 C. 

 19 C. 

 19 C. 



21-5 C. 

 18-5 C. 



21 C. 



21 C. 

 21-5 C. 



19 C. 

 21 C. 



20 C. 



19 C. 



18 C. 



19 C. 

 21-5 C. 

 21-5 C. 

 18-5 C. 



20 C. 



19 C. 



20 C. 

 20 C. 

 20 C. 

 20 C. 



19 C. 



2-6312 

 2-7816 

 2-7228 

 2-6773 



3^427 7 



3-7074 

 2^9241 

 3-6825 

 3-69»2 



3-7331 



4-008 1 

 3-9981 

 3-9 '98 

 3-89^5 

 4-0880 

 3-9850 



3-6822 

 4-1061 

 3-9343 

 3-9751 

 4-0140 

 4-I068 



3-9254 

 3-9668 

 3-9714 

 3-9407 

 3-99' 9 

 4-0019 



3-9103 



