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SECTION III
KIMBEBLITE FROM THE UNITED STATES
By PROFESSOR T. G. BONNEY
Two
rocks from the United States, specimens of which were in Professor
Carvill Lewis' collection at the time of his death, present, as will be
seen hereafter, a very close macroscopic and microscopic resemblance to
the diamond-bearing rock from South Africa. One occurs at Syracuse, New
York; the other about six miles south-west of Willard, in Elliott
County, Kentucky. For the most recent information relating to the
former rock we are indebted to the late Professor G. H. Williams; the latter has been described by Mr. J. S. Diller.
1. Rock of Syracuse, New York.1—There
are two types of this rock, according to Professor G. H. Williams; one
of these is a very dark green, almost black, rock, with minute specks
of glistening mica, occasional larger plates of a brass-yellow mineral
(4x6 mm.), and a few small masses of a lighter green more compact
serpentine with a sharp crystal form. The other is paler in colour,
composed of a dense
1 Literature.—G. H. Williams, Science, March 11, 1887; Amer. Journ. Sci. xxxiv. 1887, 137; Bull. Geol. Soc. Amer. i. 1890, p. 533. He cites Vanuxem (Third Annual Report, 1839, and Final Report on Gcol. of Third District of New York, 1842) ; Lewis Beck (Report on Mineralogy of New York, 1842); T. S. Hunt (Mineral Physiography and Physiology, 443-147); and Amer. Journ. Sci. ii. xxvi. 1838, 287 ; Geological Hist, of Serpentines (Trans. Roy. Soc. Canada, i. 174); and J. D. Dana (Manual of Geology, p. 233, third edition), as referring to it more or less in detail.
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