This wood, which was a very prominent
feature at the Paris Exposition, promises to become one of our richest
ornamental materials.
Chlorastrolite in pebbles is principally found on the inside and
outside shores of Rock Harbor, a harbor about eight miles in length on
the east end of Isle Royale, Lake Superior, where they occur from the
size of a pin head to, rarely, the size of a pigeon's egg. When larger
than a pea they frequently are very poor in form or are hollow in
fact, and unfit for cutting into gems. They are collected in a
desultory manner, and are sold by jewelers of Duluth, Petoskey, and
other cities, principally to visitors. The annual sale ranges from
$200 to $1,000.
Thomsonite in pebbles occurs with the chlorastrolite at Isle Royal,
but finer stones are found on the beach at Grand Marais, Cook County,
Minnesota. Like the chlorastrolites, they result from the weathering
of the amygdaloid rock, in which they occur as small nodules, and in
the same manner are sold by jewelers in the cities bordering on Lake
Superior to the extent of $200 to $1,000 worth annually.
THE DIAMOND CUTTING INDUSTRY.
In New York there are sixteen firms engaged in cutting and recutting
diamonds, and in Massachusetts there are three.
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