199-=—3 oe Cai [JULY, 
Composition : 3 (RO, Si O3) + 2 (Rea 03; SiOz) -+ 9 (Mg0, HO.) According 
to analysis it contains ; 
Silicie acid . = 33-41 , . 32:98 Gontains oxygen 17: 12 
Sesquioxide of chromium 6°85 PN) 
Alumina : 5 =a LOS Di lee hiletel 66 5:19 
Oxide of iron. ; 8 1°43 s 0-32 
Oxide of nickel . A trace 
Magnesia 4 ° OS CHO Gai ee) «6 ; 14°08 
Lime : ° . trace 
SRS aight i = 0:28... 0-28 ce O11 
Potash? s\you.s “ ue ROO awe OrO 6c 0-02 
Water . a . ep es IRD IE 5 1G eto? =6 11°66 
ee 
100°59 101-09 
Found near Texas in Lancaster county, associated with chromic i ror gymunite, 
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 
OF ee RMOs4 10s 03 HO. is 
14°53 ; Ceol 2 A7ol2* 30166, 
eo Ole 1: 2:34 : 1:6, which is very near 
aes 2 5 ofan 3, and gives the equivalents 
in the following proportion : 
R 
|| 
PsoRsOl Wee tSi@duaih EO 
12s p) 5 ; 9, or the formula— 
3 (RO, SiO3) +. 2 (R,Os, Si03) 4- 9(Mz0, HO). 
In the chemico-mineralogical system, this mineral is to be placed among 
the Svlicates of bases RO + Re O3 + 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. 6 : 5 6 ° - 0-2689 Pen: 
Silicie acid \ é P 5 . 0°6759 
Sesquioxide of chromium : : - 01403 és 
Alumina . ‘ é 6 ‘ ‘ a AOR i COU 
Sesquioxide of iron . : ; « 0.0327 $< 
Oxide of nickel 5 : s B trace fae 
Pyrophosphate of magnesia 5 : - 270084 8 
Lime 3 j 3 a A 4 6 trace 66 
II. 1:7406 grammes gave: 
Chloride of lithium, sodium and potassium 0-0138 grammes. 
Platinun : i : 5 “ » 0°0036 OC 
