MINERALS FROM NEW CALEDONIA. 237 
dug up ; they readily stain the fingers, and yield to the knife at 
ce, cutting like graphite, a, ir. a blue-black shining metallic 
of a grey-blac 
Some of the nodules paesnnk 4 a very vesicular structure, like 
certain kinds of lava. Even the apparently quite compact nodules 
often enclose patches of the clay, especially t a. the centre. 
Many o 
em present a very striking resemblance to the 
manganese nodules dredged up from the depths a the sea vet the 
“Challenger.” I do not feel quite justified in ut any 
ip on aie river Leia. 
Some nodules of the ore from Unia were examined, with the 
following results 
Analyses. 
Specimen No. 1. No. 2. No. 3. 
Water _ a 100’ Os 8°68 10°19 10°54 
Mine cA, oat 9°74 9°83 
Silica... 15°34 15°15 17°20 
Alum 8-70 7°65 
Tron sesquioxide ...........2...0++ 10°41 10°26 5°51 
eke o pea tees ink “BE “87 
- en oxide traces traces traces 
Savant eet peer ee aay 15°67 15°43 13°59 
an, ese eroxide (MnO 11°52 9°57 
Mangan F ee traces traces traces 
Magnesia 20:80 20°46 22°63 
100°67 100°01 99°87 
The following contains but little eee 
Analysis. 
Yysrs. 
Water lost at 100° C. a Se 2°86 
Water combined by difference ... wk ee 
Silica a : 1-06 
Alumina Se. : 11°37 
Iron nioxide eB sus = 52 
C ni ve ‘a aoe 
Mangan se ide M 0. gt Cees -¢ | 
c obalt oxid i petox fu os oleae 
Lim aes : an ne .. absent 
iteaiedia or ee ae oe ad 1-79 
