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A POPULAR TREATISE ON GEMS.
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Languedoc
are of a fiery red color, mixed with white and gray univalve shells; of
this Napoleon's eight columns for his triumphal arch in the Carousel^
at Paris, were cut.
f. The
United States "have a great many shell-marble quarries ; but they are
all black and gray. Those of Trenton Falls, Little Falls; near Seneca
lake ; Northumberland county, Pennsylvania; Bernardston,
Massachusetts, and Hudson, New York, contain either trilobites or
encri-nites; some take a very fine polish.
PISOLITE AND OOLITE.
These
minerals are likewise composed of carbonate of lime; they occur
massive, and in distinct concretional layers, either in the form of
peas or other round grains or pebbles, and are of white,
yellowish-white, brownish, or reddish color; when cut and polished,
they make a fine ornamental stone, and present a very effective
appearance. The former is found in alluvial deposits of the hot water
mineral springs of Carlsbad, in Bohemia, and the baths of St. Philip,
in Tuscany; the latter forms large beds in England and France. The
city of Bath, in England, is mostly built of this limestone.
BOCK OP GIBRALTAR.
This
is likewise a carbonate of lime; occurs massive, mostly striped; is
yellowish-white, yellow, and brownish; is only found in that rock from
whence it takes its name, and has been heretofore a great favorite for
jewelry and other ornaments. At this day we see in shops and private
houses, pins, brooches, ear-rings, seals, cane-heads, snuffboxes,
letter-holders, vases, urns, candelabras, obelisks, &c, formed of
it. It takes a high polish.
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