278 Scientific Intelligence. 
Sulphur mine in Upper Egypt.—An extensive bed of sulphur has 
been opened in Egypt between the village of Keneh and the Red Sea, 
at the strait called Bahar el Sefingue. It is soon to be worked.—Ann. 
des Mines [4], xviii, 541. 
Sulphuret of Arsenic and Sulphur in Koordistan.—This Jour. xiv, 103. 
hoes of the Granular esomtgpent * the Gneiss of the Vosges ; 
M. Det , (Ann. des Mines, [4], xx, 145.)—(1.) Mica.—-The most 
cons ee a contained in the fifiostbae is mica. The mica has 
G.=2°746 ; color greenish; lustre somewhat greasy ; — by at- 
mospheric action. Two axes of double refraction very near one an- 
other . B. exfoliates and gives out a bright light, and ore with 
difficulty to a white enamel. Analysis, p. 153:— 
iS Mn Oa Mg Na K_ Fi ign. 
8754 1980 161 O10 O70 30° 32 1:00 717 O22 1:51=99°97 
Ox. 19°51 925. 0ar.,..002, 020. 1178 026 1:22. see, 
This gives the oxygen ratio for the protoxyds, peroxyds and silica 
13-79 : 9:25 : 19-51=3.: 2 : 4, affording the formula sk Si+-H? Si. The 
optical character appears to show that the mica is a phlogopite, although 
differing from that species a little in composition. The formula given 
for phlogopite is 3k? Si+ of Si. 
(2.) Pyrosclerite ?—-Occurs especially at St. Philippe. Color gray” 
ish, to bluish, nearly emerald green; lustre greasy or waxy ; ; 
2-622. Attacked completely by muriatic acid, but without giving 
a jelly. B.B. fuses with difficulty to a white Lae) + Pe blue co 
with nitrate of cobalt. Composition, p. 157 
I 
sie te wil oe re Co ps oe a 65=100°00 
Ox. 1995 1240 —— 018 019 855 = 10:36 
The mineral bl ti t more alumina, and 
is more fusible. The formula alrded is ey meteor Si-+9H, oF possibly 
Mg? Si+Al Si+-sft. 
Pyroxene.—A pyroxene re from Chippal, afforded, p- 145— 
Al diff) 1 
ee ‘Ol 1-10 ine sl - 10 mt )  so=10000 
Specific gravity 3-048. Structure that of a alle It is pee 
Delesse paren that the original composition of the mineral may )@ 
been m y a pseudomorphic process. d, has 
. De cabs observes that the opiates of Storgard, Finlan a 
the angles nearly of Se cee and differs but little in composition 
the sahlite of Chippal rtho- 
he gneiss enclosin ng t the limestone contains both feldspar Sie ing 
clase) and ret with pyroxene and hornblende. The follow 
analyses are given 
Fe Ca Mg Na eee 
1. Orthoclase 64 4 1992 uk. 26 gay 038 218 
be Uae 2172 149 =10000 
LP aa 1483 13.18 rf a. 969 1948 ss gion 
Par coe By 
