202 



I. is «schizolite variety A» according to analysis by Chr. 

 Christensen. 



II. are the percent values calculated from the formula: 



3 Si O2 . 2 (Ca, Мщ Fe, Mg, Y) О - [Na., Н^] О. 



III. is manganpectolite (Williams), according to the recal- 

 culated analysis (see below). 



IV. are the percent values, calculated from the formula 



3 5г O2 . 2 ( Ca, Мп, Fe] О • (Na^ Н^) О. 



In the above table a manganpectolite, which William s M 

 found in nephelite- syenite from Arkansas, has been used for 

 the sake of comparison. It contains according to Williams 

 imbedded particles of calcite and the analysis shows that 0*82 per 

 cent of carbonic acid to be present. In the above table the 

 quantity of calcium corresponding to this quantity of carbonic 

 acid is deducted and the rest is recalculated on 100 percent. 



The iron in the manganpectolite and the yttrium in the 

 schizolite variety are for the sake of simplification calculated as 

 bivalent. 



As will be seen from the table the schizolite variety cor- 

 responds exactly with the generally adopted pectolile formula: 



in the same way as the manganpectolite. 



On the other hand a comparison of the analysis for schizolite 

 and schizolite-variety A leads to the supposition that a nearer 

 relationship exists between these two minerals. When disregarding 

 the fact that the schizolite contains cerium, and the schizolite 

 variety yttrium, the principal difference in composition is found to 

 be, that the latter mineral contains much more water, than the 

 former. As the schizolite looks very fresh, while the schizolite 



1) Groth's Zeitschr. 18, 387. 



