1894-95] 



223 



heavy liquid, was employed to procure the material from the 

 powdered rock. E. T. Hardman shows that "hullite" differs in 

 composition from delessite and chlorophaeite, neither of which 

 substances, by-the-by, have great credit among geologists as 

 well defined mineral species. 



Prof. Heddle,* a year later, pointed out that we know too 

 little of chlorophaeite, but gave an analysis of a substance from 

 vesicles in basalt at Kinkell, Fifeshire, which he regarded as 

 sufficiently near to the original "hullite" to justify its retention 

 as a mineral. It may be worth while to quote the two analyses 

 side by side. 



II. 



"Hullite" of Spindle 



of Kinkell, Fifeshire. 



(Heddle.) 



38'59I 



17*337 

 15-97 



trace. 



1*562 



3*944 

 8-646 



•67 

 13-476 



I. 



" Hullite " of 

 Carnmoney. 

 (Hardman.) 



Silica, 

 Alumina, 



39*437 

 10-350 



Ferric oxide, 



20*720 



Ferrous oxide, 



3-699 



Manganous oxide, ... 



trace. 



Lime, 



Magnesia, 



Potash, 



4*484 

 7*474 



Water, 



13-618 



Carbon dioxide, 



trace. 



qq*782 



100-196 



M. A. Lacroixt subsequently examined the " hullite " of 

 Carnmoney in microscopic section, and showed that the trans- 

 lucent brown substance included magnetite and calcite, and, 

 what is far more important, small crystals of felspar of the same 

 species as that which occurs so freely in the main mass of the 



* "Chapters on the Mineralogy of Scotland," Trans. Roy. Soc, Edinburgh, vol. 

 XXIX, p. 89. 



t " Sur le kirwanite et le hullite," Bulletin Soc. Min. de France, tome VIII 

 (1885), p. 432. 



