Dr.\ E. D. Thomsort's Examination of Babingtoiiite. 123 



of sulphuretted hydrogen. The highly soluble hyposulphite of 

 liuie may then be dissolved out by little more than an equal 

 weight of cold water. The solution may be evaporated at 120"^, 

 Hnd the hyposulphite of lime crystallized out; or, the solution, 

 Ji>y adding carbonate of soda, converted into hyposulphite of 

 soda, which is a more stable salt, may be evaporated at a 

 higher temperature, and crystallizes more easily. 



From the refuse-lime, one- sixth of its weight of crystallized 

 hyposulphite of lime has been obtained in a state of purity by 

 a single crystallization. When the gas is washed with sul- 

 phuric acid to remove ammonia, before being conducted into 

 the lime-purifier, it yields the refuse-lime more suitable for 

 this purpose. The preparation of the hyposulphites in quan- 

 tity is becoming the more important, as besides their use in 

 electro-plating and photography, they are likely to be applied 

 largely to the extraction of chloride ahd bromide of silver 

 from silver ores. '^l- i'jiu // 



XIX. Examination of Babi7igtonite.B7/ Robert D. 



Thomson, M.D.. Lecturer on Practical Chemistry in the 



j^ University of Glasgow^^^^^ ^^^ ^^^^^ l^„^ ^.^,^^ ^j ^^ ^^^ 



^^YNONYMS. — Axolombus Augite spar (Haidinger) ; he«- 

 ^ midomatischer Korazit (Breithaupt). 



History. — The name Bablngtonite was given in 1824, by 

 M. Levy, to a mineral occurring crystallized on felspar from 

 Arendal in Norway, in honour of Dr. Babington, one of the 

 founders of the Geological Society of London f. Hitherto 

 this mineral has been of such rare occurrence, that no analy- 

 sis of it has been made. A specimen having lately come into 

 iny possession, I have taken the oppgrtunity of subjecting it 

 to a careful examination. "i^JtB fanuol y^H ^btmh U nariw jyb 



Crystalline Form. — The crystals' examined appear foagrefe 

 exactly with those described by Levy. They occur distributed 

 over the surface of albite and associated with dark green am- 

 phibole. The crystals are sometimes six-sided, at other times 

 eight-sided, doubly oblique prisms..'<3!i,'jj7 <.zi ihiqini vii^ ;ji\-3g 



The co/oz^r of the ci-yiitals is bladkj^aabV4lM^^}r«9|itendent 

 and vitreous. '<* t{lrt"'>"<; Ji Y/'b oJ ^iji;iomnn> mod 'juiui -im. 



The hardness is 5-^5. on 'io Je^ '■ '' 



The speci/k gravity is 3*355. f^'IIbis- stated by Breithaupt to 

 be 3*406, a very close approximation ; and in Alger's edition 

 of Phillips's Mineralogy, the specific gravity is given as 3*5 

 -lu8or{V!l ofli 1o > ! c I iirnoiKoaj i&otn briu InsinsvnoD r fin 

 bhioil^ r*"C6tfinifiniciaterfby theAnthor.' "' ' •>^-, .o(ffI! y/IT .gyjidq 

 liomi hit Annals of Pjiilosopby, Second Series, vol.jV^.^j^ fS^oqzo od 



