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64 KIMBERLITE FROM THE UNITED STATES The following represent the peridotite :—
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To these notes may be added a few remarks on the specimens which I find in Professor Lewis' collection :—
The
hand specimen [436] labelled ' From James Street, Syracuse, N. Y. (G.
H. W. col. Feb. 1888)' is a dark-coloured rock of a greenish tint,
slightly mottled in one or two places with a yellower green hue,
compact in structure, dull, but with fairly numerous rather rounded
spots, up to about one-sixth of an inch in diameter, with a more
glistening lustre. The specimen is traversed by a thin whitish vein. In
fracture and general aspect it resembles a serpentine, or something
between a serpentine and a diabase, except for the slight irregularity
in the ' por-
1 Including O20 of sulphides.
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