Seventh Supplement to Dana’s Mineralogy. M1 
= this mineral but looks like a slightly altered variety. Composition according 
R. Richter (Po ee 
Si cl Ca - Mg H 
52°39 1:21 20 46 7°98 ged 3°69==100°09 
The oxygen ratio for the H, R, 8, Si, is 3-28 : 1258: 0°56: 27:20. The crystals are 
rectangular prisms, having the faces ti i+ large, and T small, with the a 7 pari: e 0. 
Ber. K6n. Sachs. Ges. der Wiss., June dom p. 92.) Scheerer regards the mine eral 
as an os of what he calls param sis 
yrgom, according to Scheerer (Ber. “én. ‘Siichs, Ges. der Wiss., June 1858, p. 96) 
is augitic in exgstalization "Richter obtained: 
l M 
x n Oa Mg 
3l 79 403 Lc 57 trace 18°98 17-40==99°77 
giving the oxygen ratio for R, #, Si, 14°06: 1°88: 269. The form is a rhombic 
ai by with the Po planes 41, —1, +2, —2, and occasionally some others, : 
— sine ne Il, in sg form of ety from differen ie — 
inic an 
- big - to occur in three directions. The angles are stated. te be only y approxima 
- Two of them, 954° and 133°, are very near angles in quartz (A: 
RETZBANYITE, R. Hermann (J. f. pr. Chem., Ixxv, 450).—This is a bismuth 
ore resembling eliaie: silver, aa yr ha are Color lead- ‘gray, but exte reg | 
oxydized and mixed with cerusite and pagent oF re. In irregular pieces with n 
Base of crystalline structure. H.==2'5. .B, fumes of sulphurous acid 
wheat is reduced to a globule of lead and 7 biomath, Afforded on analysis by R. 
8 Bi he Cu 
T14 1193 38°38 86:01 1°93 4:29==99°61 
giving the atomic nding for the oxygen, 8 ie bismuth, and other metals, 8 
and making, according to Hermann, mpound of a sulphate and rene 
With the formula aCe, PbS-+ SBiS]42Pb8. 
Rorrisrre, oe ee Nickel-Gymnite. 
Rotite [120, V].—In the vicinity of the lazulite locality, Lincoln Co., Georgia 
(see lazuli), occur, according to ©. U. Shepard pe Jour., xxvii, a splendent 
— crystals of rutile, some weighing upwards of a pound. O e has six gen- 
i 
Sapontrr.—A hydrous aluminous silicate from the waters at a nto has been: 
analyzed by by J. Nicklés bee Fvasgarns 9 Saponite, a name that has for some time be- 
longed toa magnesia mineral was found to consist of Silica 42°30, 
ahmina 1 19°20, eg 36 bet “sguivilact to AlSi3-+ 12H, or near cimolite—L Institut, 
0, 1318, staat 6, 
Garnet. The o 
alumina epidote, having G.=3-25—3°36. - 
Scxo 342, WI) — Nordenskidld has described (Deshi inland Min, 
dic., from having apparent characters of 
schorlomit mM sh 32) = me lied melanit ite fou found i in Eleolite, 
is lustrous } Reap 4 k gray, 
an contains much titanium, is either in monometric ic crystals or massive. The 
is not cited in the Jahrbuch. The formula given is Ca? Si+PeSi+4Ti0, 
To while that written for schorlomite by Whitney is Ca*Si+¥eSi+ CaTi2. 
