N.S. Manross on the Artificial Formation of Minerals. 187 
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with reéntering angles at the end, and a hopper-sha 
cavity at the center of the cross. Analysis afforded the usual 
constitution. 
Anhydrite (Ca 8).—Fifteen or twenty grammes of neutral sul- 
phate of potash were fused with four or five times as much chlo- 
rid of calcium. The surface of the cale obtained, appeared after 
cooling, covered with a film of crystalline plates, and cn breaking 
it, there were cavities occupied by groups o rectangular crystals, 
several millimeters long and two broad, but scarcely thicker than 
letter paper. Analysis afforded Ga 41-44, 5 58-50=99-94. 
Apatite.—Daubrée obtained apatite in microscopic crystals by 
passing chlorid of phosphorus over caustic lime at a red heat 
(Comptes Rendus, xxxii, 615). Dr. Manross fused phosphate of 
soda (first rendered anhydrous) with an excess of a mixture of 
chlorid of calcium and finely powdered fluor spar. ‘The result- 
ing mass was full of slender transparent hexagonal prisms, some- 
times a millimeter long, many of which ended in a pyramid 
ormed on the angles; angle over the summit 68° 15’—which 
rd 
50 of chlorid of calcium. The crystals thus obtained were hex- 
agonal, usually terminated by pyramids, a face of which made 
with a prismatic plane the angle 129° 7’, which differs more than 
a degree from the angle of apatite. G.=3-054. Analysis af- 
forded Cl 13-02, Ca 7:36, Ca*® 79:10=99-48, which requires the 
formula 3a? B+2Ca Cl. oe 
Pyromorphite (3b)? B+PbCl).—Ten grammes of tribasic phos- 
phate of soda were fused with 70 grammes of chlorid of lead. 
While the temperature was still above the fusing point of chlorid 
of lead the fluid contents were poured out, and the interior was 
found to be lined with light yellow transparent and brilliant hex- 
agonal prisms, three to five mm. long, terminating in pyramids; 
angle between the pyramidal planes and the prismatic 130° 23’, 
which is within 1/ of the angle given for pyromorphite. G.= 
7-008. Analysis confirmed the result. 
Wolfram ((#e, Mn) W).—Finely powdered native — etd 
be recrystallized by fusing with a considerable quantity of chio- 
id of sodium. 2 heat applied was such as to evaporate 
