with Analyses of Scotch Natrolites. 



273 



100-12 

 As the Glenfarg mineral, however, passes from white to red, 

 by far its most frequent colour, I also submitted a deep red spe- 

 cimen to analysis, to ascertain what the constitutional difference 

 might be; I obtained (on 25 grs.*), — 



Silica 47-84 



Alumina . . . . 27-112 



Lime 4-312 



Soda 11-304 



Water 1024 



100-808 



Here a considerable quantity of the soda is replaced by lime ; 

 the colouring matter I could not ascertain. 



Haidinger's second locality is the Campsie Hills, the exact 

 spot I do not know ; so convinced was I on receiving it that this 

 was a specimen of decomposed Laumontite, that it lay for more 

 than a year unnoticed ; on analysis it afforded, — 



Silica 47-324 



Alumina .... 27-36 



Lime 2-63 



Soda 13-354 



Water 10-392 



101-060 

 This is evidently the same substance. 



The mineral which is generally understood by the Edinburgh 

 mineralogists to be the Galactite of Haidinger, is found at Bishop- 

 town, at the locality whence Greenockite was obtained ; it occurs 

 here of a milky, and also of a delicate pinkish-cream colour. I 

 analysed both : — 



The white. 



47-60 



26-60 



-16 



15-86 



9-56 



Silica . 

 Alumina 

 Lime 

 Soda . 

 Water . 



The pink. 



47-76 



27-20 



-93 



14-28 



9-56 



99-78 99-72 



* When not otherwise expressed, my analyses are on 25 grs. 



