122 



[July, 



Composition : 3 (RO, Si O3) + 2 (R2 O3, SiOa) + 9 (MgO, HO.) According 

 to analysis it contains : 



100-59 101-09 



Found near Texas in Lancaster county, associated with chromic iron, gymnite, 

 nickel-gymnite and other minerals. 



Considering sesquioxide of chromium and alumina as isomorphous bases, and 

 in the same manner oxide of iron and the small quantities of alkalies isomor- 

 phous with magnesia, the oxygen ratio of 



3 (RO, SiOs) + 2 (R2O3, Si03) 4. 9(MgO, HO). 



In the chemico-mineralogical system, this mineral is to be placed among 

 the Silicates of bases RO -\- R'i Os -{- Hydrates, and it has some relation 

 to Chlorite and Ripidolite. Besides, most of its physical and chemical proper- 

 ties seem to be identical with Fiedler's Rhodochrom, a mineral from Tino in 

 Greece and some localities in the Oural Mountains, which by G. Rose is consi- 

 dered a serpentine, containing a large quantity of chromium ; but the latter has 

 a greenish-black color, and dissolves in hydrochloric acid. As no quantitative 

 analysis of it has been published, further examinations have to prove what rela- 

 tions exist between these minerals. I at least consider it useless to speak about 

 identity, if it cannot be proved by analysis. 



Another mineral, much resembling Rhodophyllite, but of a different composi- 

 tion, is Kammererite. 



In the following I will give a brief report of the data of the analysis, and the 

 modes which were adopted in separating the different ingredients. 



I. 2-0490 grammes of the mineral gave: 



Water .... 

 Silicic acid 



Sesquioxide of chromium 

 Alumina .... 

 Sesquioxide of iron . 

 Oxide of nickel 

 Pyrophosphate of magnesia 

 Lime .... 



Tl. 1-7 lOG grammes gave : 



Chloride of lithium, sodium and potassium 0-0138 grammes. 

 Plaliiuim . . . . . . 0-0036 



