Cox.—On the Mineralogy of New Zealand. 877 
a mawkish but not unpleasant odour, being very different in this respect 
from most rock oils, and is especially free from all traces of sulphuretted 
hydrogen. Minute flakes of a white substance float in the oil, and are 
gradually deposited when it is allowed to remain quiet at a low tempera- 
ture, nearly the whole of this solid substance becoming dissolved when the 
oil is gently heated. Boils at 340° Fahr., and does not appear to evaporate 
at ordinary temperatures. Vapour inflames at 260° Fahr.; does not con- 
tain paraffin. Very valuable as a lubricant on account of ite low freezing 
and high volatilizing points. 
2. Poverty Bay.—A true paraffin oil. Opalescent and thickly inter- 
spersed with minute flaky particles of a white colour; by warming the oil 
gently these particles subside, and the oil manifests the following cha- 
racters : translucent in masses of considerable thickness; colour, red by 
transmitted and blackish-green by reflected light; flows readily and gives 
off the usual odour of crude petroleum. Its boiling-point at 80 ins. baro- 
metric pressure varies from 289° to 291° Fahr. The temperature at which 
the vapour inflames is from 230° to 238? Fahr., and sp. gr. from ‘864 to 
‘871 at 60° Fahr. Passes into a jelly-like mass at 50° Fahr., owing to the 
quantity of paraffin dissolved in the oil. 
3. Manutahi, Waiapu River.—Is the lightest natural mineral oil ein 
in the colony. Colour, pale brown ; nearly or quite transparent; does not 
manifest a green-black colour by reflected light; flows with great freedom ; 
has the odour of kerosene; sp. gr. :8294 at 60? Fahr.; burns well in a 
kerosene lamp for some time. Contains only traces of paraffin, and does not 
acquire any increased consistency when the temperature is lowered to 8? Fahr. 
For details concerning the constitution of these oils I must refer the 
reader to the paper above cited, and also to another by the same author 
(Trans. N.Z. Inst., vol. xi., p. 469). 
Dopplerite.—A mineral grease resembling dopplerite was collected by 
Dr. Hector from Waiapu in 1872, and during 1880 a specimen of the same 
mineral was forwarded to the Colonial Laboratory for examination on the 
supposition that it was ozokerite or native paraffin. 
This substance is, of a soft greasy nature, brownish-yellow colour, and 
possesses a strong odour of paraffin. It burns readily with a smoky flame, 
leaving a large quantity of ash, and consists, according to Mr. Skey (Trans. 
N.Z. Inst., vol. xiv., p. 898) of 8:1 per cent. oils; 9:3 per cent. paraffin ; 
26:9 per cent. earthy matter; 11:8 per cent. water; and 49:4 per cent. 
oxygenated hydro-carbons. 
Ozokerite, CH.— This mineral is mentioned by Dr. Hector (Jurors’ is 
N.Z. Ex., 1865, pp. 267, 488) as occurring in the brown coals of Dunstan, 
Otago. We have, unfortunately, no specimen of this. 
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