84 GEORGE I. FIN LAY ^ 



ANALYSIS P. TENTATIVE 



Albanose (Leucitite). Professional Paper 14, p. 350, sec. 4, No. i 

 Alban Hills, Italy 



at once appears that ackermanite (am), is the mineral lower in SiOj 

 for the same amount of CaO. By taking 96 CaO from the diopside 

 and using with it 72 SiOa we make 24 molecules of ackermanite, i. e., 

 24 (4CaO. 38102). By recalculating for new diopside and putting 

 in the 24 molecules of ackermanite (am) (calling for 72 SiOj with 

 96 CaO), we find that as the result there is no deficit of SiOa. To 

 ascertain just the right amount of ackermanite to be introduced we 

 make use of the simple formula where 

 -v = the deficit of SiOa 



■■ the number of ackermanite molecules to be made. 



It appears on trial of all such cases that the deficiency in SiOj is 

 exactly allowed for when the number of ackermanite molecules made 

 with CaO taken from diopside equals one-third of the SiOj deficit, 

 and in consequence we take lime away from diopside equal to four 

 times the number of ackermanite molecules. Numerically it is 

 found that for every unit of CaO taken from diopside and used in 

 ackermanite we gain three-fourths of a unit in silica, though the 

 process involves the making of new olivine which itself uses up silica. 

 So then to make up a deficit of 74 SiOa we need to take 96 CaO from 

 diopside, 96 CaO 4- 72 SiOj making 24 molecules of ackermanite. 



