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Ch. 6:Other Gems

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362
A POPULAR TREATISE ON. GEMS.
SERPENTINE.
This mineral derives its name from its variegated color, which resembles the skin of a serpent. It is generally divided into two varieties: the common, or opaque serpen­tine ; and the precious, noble, or twnslucent serpentine.
Serpentine occurs massive; the common is occasionally crystallized in rhomboidal crystals,—in Norway, New Jer­sey, and Pennsylvania; it has a splintery, uneven, and con-choidal fracture; is unctuous to the touch; yields to the knife; its colors are green in all its shades, but also reddish and grayish; hardness, 3.4 ; specific gravity, 2.5 ; is infusi­ble before the blowpipe, but with borax dissolves into a transparent glass. It does not belong to the stratified rocks, but to the ophites of Brogniavt, and is mostly asso­ciated with granite, gneiss; micaceous, chlorite, argillaceous schists, and limestone; it therefore belongs to the primi­tive formation.
Serpentine, for richness and variety of colors, exceeds all other rocks; and it abounds all over the globe, in large consolidated masses. The finest precious serpentines come from Fahleen and Gulsjo, in Sweden, the Isle of Man, the neighborhood of Portsay, in Aberdeenshire, Corsica, Sibe­ria, and Saxony. Common serpentine occurs at Lizzard Point, in Cornwall. In the Alps we find the serpentine nine thousand feet high; in France, the mountains of Li­mousin ; in Spain, Norway, Sweden, Scotland, the Shetland Isles, England, Italy, Bohemia, Saxony, Bavaria, and Swit­zerland; in the United States we find it all along the Atlantic coast, where the primary rocks are found, as at Hoboken (New Jersey), opposite to New York city, War­wick (New Jersey), as far as Maryland, at Bare Hills, through Pennsylvania, Rhode Island, Connecticut, Massa­chusetts, Vermont, &c. The serpentine beds of Massachu-
Ch. 6:Other Gems Page of 515 Ch. 6:Other Gems
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