238 Miscellaneous. 
Experiment. Theory, C4)H,¢.02,8. 
Carbon . ; . 79°34 a(S 
Hydrogen 5 - 10-41 10:23 
Sulphur . < - od2 « 9°28 
Oxygen . : 3 2593) 5°28 
100-00 100-00 
The formula above given corresponds very closely with that 
usually accepted for some pure varieties of retinite, but the oxygen 
of retinite is here partly replaced by sulphur. In fact, tasmanite 
would seem to be the sulphide of the same radical of which retinite 
is the hydrate— 
Con S tasmanite. 
20H ie O retinite. 
These minerals may be derivatives of a turpentine, C,)H., ; or the 
radical assumed to be present in them may be homologous with 
benzoyle, for C,)H3,0 = 18CH, + C,H,0. 
Benzoyle. 
Note oN ANTIMONY-MINERALS FROM Borneo.—WNative Anti- 
mony is found in masses of various sizes, always coated with a 
thickish crust of cervantite (antimony-ochre). ‘This native anti- 
mony is nearly pure; occasionally it is found associated with the 
sulphide of antimony, and, from this locality, is always of a very 
fine granular texture, sometimes very friable, and often tarnished. 
Antimonite, or sulphide of antimony, is found massive in great 
abundance, large quantities being shipped, for smelting, to England 
and Hamburg. 
Cervantite, or antimony-ochre, is found in very large quantities, 
hundreds of tons being shipped for smelting. This is derived - 
entirely from the decomposition of the sulphide, in cavities of which 
sometimes terminated and acicular crystals of the original sulphide 
are found. On some of these altered crystals are found, but 
rarely crystals of.Valentinite, in flat tables, usually coated with 
antimony- ochre. 
Kermesite, or red antimony, is found only sparingly with the cer- 
vantite and sulphide, as a reddish powder. Native arsenic is also 
found associated with the antimony-ores from this locality.—J.R.G. 
Nore ON THE ANTIMONY-MINERALS FROM ALGIERS.— Senarmon- 
tite is found in three forms; namely, in transparent and opaque 
octahedral crystals,—as botryoidal incrustations, of a snow-white 
colour, and massive and compact, of a greyish colour. This min- 
eral is worked largely at Ain-bebbouch, in Constantine, Algeria, 
as an antimony-ore, and is exported for smelting to this country 
in considerable quantities. 
Cumengite, a variety of volgerite, is found in radiating fibrous 
masses, yellowish white to perfectly white in colour, in the province 
of Constantine, Algeria.—J. R. G. 
