VICTORIAN METEORITES, WITH NOTES ON OBSIDIANITES. 
later (12, p. 306) that this substance was derived by decomposition 
from the cohenite, from which he obtained it as small, dense, highly 
lustrous pieces. As previously stated under cohenite, in Cran- 
bourne No. 2, Cohen regards its identification as sufficient evidence 
of the presence of cohenite. 
Lawrencite.-— A determination was made on some pieces of the 
meteorite resulting from disentegration, weighing together 457 grams, 
to ascertain, if possible, the amount of lawrencite present. They 
were first leached with water and afterwards with sulphuric acid, 
and gave respectively - 515 and '274 per cent, of chlorine, or together 
1*412 per cent, of ferrous chloride. As the pieces were only partly 
oxidized, the determination is probably lower than the actual amount 
present, on account of the density of the iron preventing a thorough 
leaching taking place. Cohen noticed that the exudation appeared 
mostly, if not altogether, along the taenite plates. From this he 
concluded that between the taenite lamellae and the kamacite in 
the unaltered nickel-iron there is not such an intimate contact as 
between the particles of kamacite. Owing to its expansion in 
oxidizing, the lawrencite forces the lamellae apart and, at the same 
time, strongly attacks the nickel-iron, so bringing about disintegra- 
tion and decomposition. 
Graphite. Graphite, besides occurring as an envelope round 
the troilite, sometimes forms nodules without troilite. Cohen could 
not obtain sufficient material for an analysis, but he estimated the 
specific gravity at from 2*250 — 2*292. 
Silicious Residue. The residues consisted mostly of dull white 
grains which could be compared to a silicate decomposed by hydro- 
chloric acid. Cohen thinks that they were derived from olivine. 
There were also present a number of colourless, transparent grains, 
w li ch were undoubtedly quartz. They were soluble in hydrofluoric 
acid and insoluble m the microcosmic bead, and gave brilliant inter- 
ference colours The presence of quartz splinters in the stilpno- 
siderite, formed by the decomposition of troilite, has been mentioned. 
Li the residue, after treating with hydrofluoric acid, were some six- 
sided opaque crystals, which, as they gave chromium reaction, might 
have been chromite. Besides these, he noticed minerals resembling 
augite, hypersthene, tourmaline, and a zircon microlitli. 
LANGWARRIN METEORITE. PLATE III. 
Class. — Siderite. — Broad Octahedrite. 
Weight . — Originally 18 cwt. 
T mUeS A E °'kh Langwalrin lailw v station, 
(Lat. 38 12 S., Long. 145° 14' E.), section 94, Parish of Lane- 
warrin, County of Mornington.* ^ 
Date of Discovery. — 1886. 
Date of First Record. — 1886. 
Collection . — National Museum, Melbourne 
References .— 1 (p. 60), 15, 45, 57 (pp. 268,’ 271, 272). 
* The position was not exactly known at the da tehJArrier. son’s paper (1 iTThT 
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