F. D. Adams—Chlorine in Scapolites. 315 
tinct rounded lateral lobes. Tentacles slender, slightly wrink- 
ed; branchize numerous, crowded, fusiform. Color, yellowish 
white, with a flake-white line on the upper side of foot, posteri- 
orly; tentacles tinged with salmon, with flake-white specks or 
a streak, distally; branchiee with salmon, yellowish brown, red- 
dish brown, or purplish nucleus, and’specked at the end with 
flake- white, which sometimes forms a ring, near the tip. 
Length, 10 to 82™™. 
Art, XL.—On the Presence of Chlorine in Scapolites ; by FRANK 
D. ADAMS. Contributions from the Laboratory of the Shef- 
Jield Scientific School. No. LIV. 
In the present paper I wish to call the attention of mineralo- 
gists to a fact which appears to have been hitherto almost en- 
tirely overlooked, namely, the presence of chlorine in minerals 
of the scapolite family. In a paper which appeared in the An- 
nalen der Chemie und Pharmacie, xlvi, p. 840, 1843, Dr. Carl 
Schafhiutl details the results of his examination of “ Porzel- 
lanspath.” It was called passauite by Naumann, and classed in 
Dana’s Mineralogy as an altered ekebergite. The mineral was 
first analyzed and made a distinct species by Fuchs, who, in 
his Mineralogy, published in 1842, assigns to it the formula 
4X1 Si+4Ca Si+€l Na, 
which requires 7-83 per cent of sodium chloride. He, however, 
supports the formula by no analyses. Dr. Schafhiutl employed 
several methods in determining the chlorine. In one, the pow- 
dered mineral was heated in a retort with concentrated sulphuric 
acid and the distillate caught in a tube containing silver nitrate. 
This method required care, but gave good results. He then 
tried fusion with barium carbonate, or sodium carbonate. Only 
a little chlorine was found when a red heat was employed, and 
none at all when a white heat was given. But a satisfactory 
result was obtained by fusing with barium carbonate in a very 
thin platinum crucible, some of the carbonate being placed on 
top of the mixture, and the heat supplied by a Fuchs spirit 
lamp. The quantity of chlorine in the mineral was found to be 
‘924 per cent, an amount just sufficient to saturate the potassium 
present. From his analysis he deduced the following formula: 
2 2(CaO, SiO 
4(A1,0,, SiO,)+ | s a t 41KCl, 
This analysis of Dr. Schafhiutl’s is the only one in the lists 
of analyses of scapolites given in Dana’s Mineralogy, in which 
chlorine is mentioned as one of the constituents. 
