Ninth Supplement to Dana’s Mineralogy. 367 
ScaPo.ire [p. ae fo If, V).—An examination of paralogite by K 
ee it to ¢, confirm rming its identity with scapolite, as  Berpev tad sug- 
ested oe Redingott' (Bul Imp. Acad. de 8t. Pensa, i, 229). 
Serrentine [p. 282, I-VIIT).—C. W. Hultmark has = the chrysotile and 
serpentine from Sala, Sweden (Jour. prakt. Chem., \xxix, 878). 
Si Al Fe Meg ere bese 
Chrysotile, 1. 41°03 1:43 125 4604231 te. IBZ 99°74 
Serpentine, 2. 41:02 1°84 1°81 42°21 &. 12°91 048100" 27 
Stiumanrre [p, 265, 513].—An optical examination of this mineral by DesCloi- 
see has fina ~ a = rest the question as to om relations to kyanite, Its optical 
eitt is ic. With thi 
e same opt tical properties, they also differ from kyan 
—_ ity. A new analysis of sillimanite by Sines gave: (Ann. des Mines (oh pe 
19.) 
Si Al Fe Mn 
39°06 59°53 1-42" 0'28=100°28 
from which DesCloizeaux concludes that the composition of sillimanite is _ 
while kyanite is —_ *, To establish this point fully, will require an accurate e 
ernie oo only of the dese of sillimanite, but also of fibrolite and on 
d 
Sriver re 15, III, 1V].—A oa of silver after stephanite is described 
byG. vom Rath in Pogg. Ann., cxi, 266 
Sopauire [p, 229, - VI, VUI).—Two varieties of sodalite from Monte 
have been analyzed by Rammelsberg (Pogg. Ann, cix, 574). 1. Colorless bare 
crystallizes in regular ae ae sagen is associa wit augite and mica; sp. gr. 
2°136. 2. Green sodalite, is are, crystallizes in dodecahedrons with cubic 
planes, Soren in limestone with yess and nepheline. The analyses, calculating 
the chlorine as combined with sodium give 
i Na 
a. 38°12 31°68 18°49 6°69 4°37=99.35 
2. 38°76 8462 21°18 2°55 1°67=98°78 
The oxygen of the soda, alumina and silica in Lae ie sigs 14°79: 19°79; in (2.) 
5-43 : 16°17: 2012, or very nearly 1:3:4 in both v 
a elsberg —— it as “Sat ADS er with varying portions of 
chlorid of sodium 1.) the amount of sodium combined with the chloro is 
equal to one-thir @ ths: a existing as siete, while in (2.) it is but one-ninth, The 
formulas given for the two varieties a 
1: Seeriti a AGH a Siac s-oteai KOS) 
2. ee ee ee 
The author argues a en double silicate is isomorphous with NaCl, as 
stances combined in various ie oa iene sil baie the same crystalline piso No.1 
has the same compositio Greenland, and the blue 
from it Litchfield, Sele, pts the Tmen one 
Decomposed sodalite 
ay. variety ne weat shoved Flean from Ppeert hg Te occurs in cagemnie 
cahedrons with black Sorabionts (arfvedsonite?). Decom ot acids. 
Si Al Na cl Hi (loss). 
43°20 82°54 11-42 3:00. i. 984 
Oxygen 22-48 15°19 ia Oat . 895 
The ratio for R, 41, Si, H, is nearly 1:4:6: 2, - which the author gives the for- 
mula 38 Si R184 60q, 3 but it may os questionable whether this substance is 
~ homog dw being considered my A distinct chemical compound, 
Am. Jour. Psat plese mag txt No. 93.—Mar, 1861. 
48 
