﻿270 Prof. How on the Mineralogy of Nova Scotia. 



Epichlorits. Delessite from Mielen. 



Silica . . . 



. 40-88 



3107 



Alumina . . . 



10-96 



15-47 



Peroxide of iron 



. 8-72 



17-54 



Protoxide of iron 



8-98 



4-07 



Magnesia . . 



. 20-00 



19-14 



Lime .... 



0-68 



046 



Water . . . 



1018 



11-55 



100-38 99-30 



As epichlorite occurs in veins in serpentine, and Delessite is 

 found coating and filling the cavities of amygdaloid, the mineral 

 now described is probably the latter, perhaps mixed with some 

 free silica. 



Fahlunite. — On the road between Windsor and Chester gra- 

 nite is found, at some point not mentioned to me, containing 

 crystals which present the characters of chlorophyllite, or one of 

 the varieties of Fahlunite. They are many- (perhaps 12-)sided 

 prisms, sometimes half an inch across, greenish brown and dull 

 externally ; the distinct basal cleavage shows faces of a grey 

 colour and vitreous lustre ; weathered surfaces of this kind have 

 the appearance of mica ; hardness of the fresh faces about 3 ; 

 streak grey and earthy. The mineral fuses before the blowpipe 

 on the edges to a black slag, yields a little water on ignition, 

 gives abundance of protoxide of iron to cold hydrochloric acid 

 on standing for some time, and a very small quantity of peroxide ; 

 by fusion with alkaline carbonate its other constituents are found 

 to be silica, alumina, manganese, a trace of lime, and a little 

 magnesia. I made no quantitative analysis ; but it is evident the 

 mineral belongs to the species Fahlunite, which results from the 

 alteration of iolite*. 



Silicoborocalcite in a new locality. — It is an interesting fact 

 that this new mineral, which was first described in the last part 

 of these u Contributions"-!*, and which Dana has since called 

 HowliteJ, has recently been found in gypsum in a new locality 

 some thirty or forty miles N.E. of Brookville near Windsor, 

 whence it was first obtained. The quantity is said to be by no 

 means inconsiderable; and as I have shown § that the mineral 

 will probably admit of a special application, just as it occurs, in 

 enamelling iron, it may prove to be a valuable addition to the 

 already large and varied mineral resources of the province. The 

 specimen by which I identified the species recently found was in 



* Dana's 'Mineralogy,' 5th edit. p. 484. 



f Phil. Mag. Jan. 1868. 



% Mineralogy, 5th edit. p. 598. 



§ Mineralogy of Nova Scotia, p. 141. 



