COMPOUNDS OF CERIUM, YTTRIUM, LANTHANUM. 201 
Wavellite. 
Trimetric. Usually in small hemispheres a third or half 
an inch across, attached to the 
surface of rocks, and having a 
finely radiated structure within ; 
when broken off they leave a stel- 
late circle on the rock. Some- 
times in rhombic crystals. 
Color white, green, or yellowish and brownish, with a 
somewhat pearly or resinous lustre. Sometimes gray or 
black. ‘Translucent. H.=3°5-4. G.=2:5. 
Composition. Al;O, Py+12aq = Phosphorus pentoxide 
30°16, alumina 38:10, water 2674=100. 1 to 2 per cent. 
of fluorine is often present, replacing the oxygen. B.B. 
whitens and swells, but does not fuse. Colors the flame 
green, especially if previously moistened with sulphuric 
acid. Moistened with cobalt nitrate, assumes a blue color 
after ignition ; gives much water in the closed glass tube. 
Diff. Distinguished from the zeolites, some ‘of which it 
resembles, by giving the reaction of phosphorus, and also 
by dissolving in acids without gelatinizing. Cacoxene, to 
which it is allied, becomes dark reddish-brown before ‘the 
blowpipe, and does not give the blue with cobalt nitrate. 
Obs. Occurs at the slate quarries of York County, he 
and also at Washington Mine, Davidson County, N. C.; 
Magnet Cove, Ark. It was first discovered by Dr. Wave 
n clay slate in Devonshire. Occurs also in Bohemia and 
Bavaria. 
Zepharovichite is near wavellite. 
Mellite or Hon-y stone. In square octahedrons, looking like a honey- 
yellow resin ; may be cut with a knife. It is an aluminum mellate. 
Found in Thuringia, Bohemia, Moravia, ete. 
Dawsomte. Uydrous aluminum-calcium carbonate, from a felsyte 
dike near Montreal. 









CERIUM, YTTRIUM, ERBIUM, LANTHANUM, DIDYMIUM. 
Known in nature in the condition of fluorides, tantalates, 
columbates, phosphates, or carbonates, and also as constitu- 
ents in several silicates. 
Yttrocerite. 
Massive, of a yviolet-blue color, somewhat resembling a 
