On the Chemical Composition of Harmotome. 39 



minerals affords forms which are identical with some of the crys- 

 talline forms which are common to both minerals, — .and this is 

 the case in regard to philipsite and harmotome, — we can hardly 

 maintain the diversity of the two substances, merely because 

 these cleavage-forms may not be identical with one another, if 

 other circumstances tend to establish the connexion of the two 

 bodies. 



I shall here, with the view of enabling every one to draw his 

 own conclusion as to the probability of the ultimate reconci- 

 liation of the constitution of the two varieties, subjoin Tables 

 containing all the analyses of the mineral with which I am 

 acquainted, and shall annex the composition of both varieties 

 calculated by the atomic weights of Berzelius, according to the 

 chemical formulae corresponding with KS* + 2 CS* -f 10 AS* 

 4- 15 Aq for the lime variety, and 3 BS^ + 10 AS* -f- 15 Aq 

 for the barytic variety. It will be observed that the Strontian 

 mineral approaches nearer the theoretical composition than any 

 of the other barytic varieties, in so far as respects baryta and the 

 other replacing constituents, which is perhaps a step not alto- 

 gether without importance, towards a more perfect accommoda- 

 tion of the two varieties, although, as respects sihcaand alumina, 

 some of the other analyses come nearer the formula. 



LIME HARMOTOME. 



