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MANHATTAN ISLAND
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Chlorite, silicate
of aluminum, iron, and magnesium, rather frequent, in small green
scales, 5th Avenue and 104th Street, Manhattan Avenue and 104th Street.
Chromite, oxides of chromium and iron, reported in serpentine in octahedral crystals at 60th Street, North River.
Chrysoberyl, a
mixture of the oxides of aluminum and beryllium, and a rare mineral,
has been found by Dr. Wallace Goold Levison in an excavation on the
north side of 88th Street " near to and east of Amsterdam Avenue." It
was a twin crystal, and was unique, as no other examples of this
interesting
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Fig. 31. Crystallographic outline of the twin chrysoberyl found by
Dr. Levison.
species had been found on the island. It was found in a " coarse aggregation of smoky quartz, feldspar, and mica."
"
The color of the crystal is a light yellowish green, resembling the
chrysoberyl of Haddam, Conn. A fragment of an adjacent crystal is more
yellow. Its material is quite transparent."
Fig.
32 is an enlargement, by photography, made by Dr. Levison, of this
phenomenal find; originally published in his pamphlet. In 1901 Dr.
Levison's further investigation was rewarded by finding at 93d Street
and Riverside Park a suggestive occurrence of chrysoberyl in six parts,
being portions of a large broken crystal, " all somewhat separated and
dislocated and buried in quartz," the latter brecciated. The color is a
yellow green; it is associated with oligoclase and bright red garnet.
Niven and Hidden re-
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