Ga/ylussiie and Hanhsite from California. 135 





Tabular Crystals. 



Prismatic Crystals. 





I. II. 



Average Eatio. 



III. Ratio. 



S03 .... 



45-89 45-98 



45-93 -574== 9- 



45-78 -572= 9- 



CO, .... 



5-65 



5-65 -128= 2-01 



5-63 -128= 2-01 



Na,0.... 



43-27 43-43 



43-35 •699r=10-95 



43-61 -703 = 11-07 



CI .... 



2-21 



2-21 -062= -97 



2-28 -064= 1-01 



K .... 



2-40 2-55 



2-48 -063= -98 



2-39 -061= -96 



IdsoI. 



•22 -16 



•19 



-12 



The analyses are almost identical, indicating that chlorine 

 and potassium are not accidental constituents. The ratios of 

 SO3 : CO, : Fa,0 : Ci : K are very close to 9 : 2 : 11 : 1 : 1 corre- 

 sponding to the formula 9 JSTa.SO, + 2 Na^COg + KCl. 



Of the previous analyses, that of Mackintosh yields the 

 ratio of SO3 : CO, :C1 = 9 : 1-93 : 1-04, fully supporting the 

 above formula, but no further comparison can be made, as the 

 bases were calculated wholly as soda. The analysis of Pen- 

 field gives the ratio SO3 : CO, : Na,0 : CI : K=9 : 2*03 : 10-89 : 

 •99 : -99, which is fully in accordance with the above formula. 



Further, in order to show the close agreement between the 

 analytical results and the theoretical composition, the analyses 

 with the exception of that of Mackintosh are given below, 

 after deducting impurities and recalculating to 100 per cent. 



Tabular Crystals. 



Prismatic Crystals. 



Penfield's. 



Theory. 



SO3 46-11 



45-92 



46-21 



46-02 



CO, .... 5-66 



5-65 



5-74 



5-62 



Na,0 43-53 



43-74 



43-32 



43-59 



CI 2-215 



2-29 



2-26 



2-26 



K 2-485 



2-40 



2-47 



2-49 



100-00 100-00 100-00 100-00 



"With the close agreement of these three complete analyses, 

 together with the partial one of Mackintosh, made on entirely 

 different samples, on crystals collected at different times and 

 from different parts of the deposit, there can be no doubt that 

 both potassium and chlorine are essential constituents of the 

 compound and the somewhat complicated formula, 9Na,S0^. 

 2]!^a,C0j. KCl is the correct one. It is scarcely possible that 

 potassium and sodium are isomorphous in this mineral, for 

 potassium seems always to be present in quantity just sufficient 

 to form KCl with the chlorine. The compound furnishes a 

 very interesting example of the exceptionally rare occurrence 

 of three acid radicals in a naineral. 



In conclusion, the author wishes to express his indebtedness 

 to Prof. S. L. Penfield for his valuable advice and assistance, 

 and also for his very kind interest in the work, throughout the 

 entire investigation. 



Mineralogical Petrographical Laboratory, 

 Sheffield Scientific School, May, 1896. 



