246 MINERALS FROM NEW CALEDONIA. ~~ 
Allophane.—From a small island to the south of New Cale- 
doni 
nia. 
As an incrustation, of a pale blue colour ; hardness about 3, 
brittle, is readily cut with a knife, yields a shining streak, adheres 
somewhat to the tongue, translucent, resinous lustre, fracture flat 
conchoidal. 
Before the blowpipe it loses colour somewhat and becomes more 
or less white and opaque, splits up, but does not intumesce or fall 
to a powder ; at first it imparted a pale green tinge to flame, infu- 
sible, in closed tube gives off water, and with microcosmic salt a 
skeleton of silica. When strongly ignited with cobalt nitrate a 
blue mass is left. Gelatinizes with hydrochloric acid. 
Halloysite.—Of pale tints of grey, yellow, green, and brown— 
found in the crevices of the rocks at Yate. 
At some future time I hope to examine some of these speci- 
mens rather more in detail; many of them appear to be w 
worth further investigation, but chemical analyses necessarily take 
end Dr. Leibius, 
Senior Assayer of the Sydney Branch of the Royal Mint, for his 
kindness in making for me the seven analyses marked with his 
