188 N.S. Manross on the Artificial Formation of Minerals. 
most of the chlorid. The mineral formed a dark stratum in the 
bottom of the crucible, and the crystals were in brilliant grains 
and beaded erystals, not admitting of measurement. 
Tungsten (6a W).—Neutral tungstate of soda was fused with 
an excess of pure chlorid of calcium in a Hessian crucible. After 
a strong heat for half an hour, it was allowed to cool gradually. 
White glittering grains were obtained which were unmodified 
square octahedrons; angle over a basal edge 130° 20. G.= 
6:0759. In one case when the heat applied was rather low and 
the cooling somewhat rapid, the tungsten was in the form of 
needles, each needle being made up of a series of octahedrons, 
44 of which were counted in one needle. Analyses gave W 80-42, 
Ca 19°58, 
Scheeletine (p> W).—Ten grammes of tungstate of soda were 
fused with 47 of chlorid of lead. In the dark green mass there 
were cavities lined with brilliant crystals which were square octa- 
hedrons; angle over a terminal edge, 99° 46’. There were 
planes of another octahedron at the summits. G.=8-232 an 
‘238. Composition Pb 4665, W 53°35. 
Wulfenite (Pb iio),—Hausmann has described this mineral as 
occurring in the walls of a furnace at Bleiberg in Carinthia. (Ann. 
h. u. Pharm., Ixxxi, 224). Four grammes of neutral molybdate 
of soda were fused with 24 of chlorid of lead. The crystals ob- 
tained appeared like hexagonal plates with unequal angles. They 
were pale yellow, and some of them more than two millimeters 
across. On dissolving the excess of chlorid of lead, square 0C- 
tahedrons were found, many of which were tabular by the en- 
largement of two opposite faces. Angle over a terminal edge 
43’. G.=6°811. Analysis gave 60-59 p. c. of lead. 
Crocoisite (Pb Gr).—In the first trials the heat was too high and 
the chromic acid was mostly reduced to oxyd. In another trial 
transparent crystals were formed, having the color of the native 
chromate. 6-118. Streak orange-yellow. Analysis Gr 32°763 
Pb 67-239=100-002. . 
Anglesite (Pb 8).—By fusing together neutral sulphate of pot- 
ash and an excess of chlorid of lead, crystals were obtained which 
had the tabular form and many of the modifications of sulphate 
of lead. As the result was not quite satisfactory, a more success- 
ful trial was made in the wet way. 
A solution of sulphate of potash was prepared, forming 4 
stratum an inch deep in a tall beaker glass. Several inches of 
pure water were carefully filtered upon this stratum so as to leave 
it undisturbed. A few grammes of chlorid of lead were fused to 
a cake and suspended by a platinnm wire, just within the surface 
of the fluid. It was then set aside for some weeks. At first a 
white cloud was formed when the stream of dissolved chlorid 
reached the solution of sulphate below. But as the latter be- 
came diffused through the fluid, the cake of chlorid, and eve? 
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