1^10 A-SFALYSIS OF JADE. 



Thealkalfne The nqiieous Solution of alkaline sulphate, being left to 



llledhTcr]^' ciT^ta'lize slowly, showed itself to consist of sulphate of 



stallization. soda and sulphate of potash. These salts when crystallized 



weighed 74 parts. The sulphate of soda after calcination 



weighed 24"G parts ; that of potash 15"4 parts. Assuming- 



for these' salts the proportions assigned by Kirwan, we find, 



that the s^tone contained 10*83 parts of soda, and S*44 parts 



of potash. 



Component On putting together thes^e results, we find, that 100 parts 



'^''^'' Sllex 53-75 



Lime 1275 



Alumine 1*5 



Oxide of iron 5 



Oxide of manganese ••••, 2 



Soda 10-75 



Potash S-o 



Water 2'95 



96-5 

 Loss 3*5 



100. 



Differs from all Hence the nephritic jade appears to have no resemblance 

 other stones. ^^ ^^^^, ^^^.^^ hitherto analysed. 



Analysis of the Saussurite, tenacious jade of Hani/. 



Specimen of For this analysis I selected a rounded pebble, found on 

 saussurite, or ^y^^ borders of the lake of Geneva by my father, who con- 

 tenacious jade, , 1 • 1 T 

 described. sidcred it as a pure and w^eil marked jade. Its colour was a 



deep leek green inclining to sea green. Its surface, polished 

 on one side by art) on the other by natural attrition, was 

 smooth, sliining, oily to the sight, and greasy to the feel. 

 Its fracture was dull, not lamellar, fine-grained, and with 

 large scales. On the edges it was translucid. Its tenacity 

 was very great, and similar to that of the nephritic jade. It 

 easily scratched rock crystal, but was scratched by the topaz 

 and the emerald. Its specific gravity was 3*26l. That of 

 specimens weighed by my father was 3-318, 3'327,and 3-389. 

 It was free from diullage, or smaragdite, which is almost al- 

 ways 



