Mineralogical Notices. 251 
specimen in the Berlin Royal Museum he obtained the angle 
129°, near that given by Breithaupt ; but one of the planes ( (P) 
was not a cleavage plane. The other plane (M) was transversely 
striated and a second cleavage was found parallel to the striations, 
which gave with M the angle 141° 32/-141° 35’. This angle is 
the same observed in petalite, and this was confirmed from speci- 
mens by Prof. Rose, who obtained 141° 35 to 142°.  Petalite 
affords in the same zone on the other side of M still a third cleav- 
age (imperfect, however,) which according to Breithaupt forms 
with M the angle 117°; but this was not detected with certainty in 
the mineral castor ; the largest specimen in hand was but five lines ~ 
long. The following results show the similarity in composition, 
0 
Si cl] 
: oe "7-067 18:000 2660 2273= 
. Cas 18°856 Liandtraceof K, Naz: “160, Bo 0°613==100-241, Plattner. 
The aiecoctorn with the blowpipe and acids are also similar. 
Manganesian Idocrase, (M. Websky, Pogg., Ixxix," 166.)— 
This idocrase is associated with a mangan-epidot Be ae fereclin 
- mo > A 
and a fusible mica in quartz, at St. Marcel in he “% 
crystals are like those of ordinary idocra hur to 
hey yellow; streak white. Glass of borax Be “as ‘small «por- Ps 
tion of the mineral becomes readily i in the oxydation flame Ofen: :** 
amethystine color; and in the reduction flame with tin n there ' isa 
Weak iron reaction : 
Thulite from the Iron Mine Klodeberg near Arendal, Norway, — 
(N. J. Berlin, Pogg., Ixxviii, 414.)—The thulite off locali ity. 
resembles rhodonite ; it occurs massive, with a splintery | fracture. # 
and fine rose-red color. G.=334. Composition according ton” *, 
Berli re ¥ 
S aonaue- 3 
— te 2 toe 
Si Al Fe Ca * Mess Me  YV ign. “eter! 
4028 81:84 154 21:42 066 095 022 1:32 ==9823; Hos er 
the alkali was undetermined. The constitution is that of idote. a 
Allanite from Krux near Schmiedefeld in Thiringer: Wolk ld, af *: 
(H. Credner, of Gotha, Pogg. , xxix, 144.)—The allanitéoécurs m *2 
in a coarse granite, and also along with crystals of specular, oe 
i ; 1a 
~ ‘determinations. Not magnetic. ‘ou 
jet black, with a faint greenish. — ka > . 
ish-gray, inclining aan eee at tok —_—_ - 
with borax, and more distinctly. still as salftof’p h 
in ati pe a brownish y ellow vhicl 
