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GARNET.<br />
The garnet has been known from earliest times, and has always<br />
been exceedingly popular. Once it commanded a high price, and<br />
was frequently, as well as spinel, confounded with ruby. "Stones<br />
of the same color," explains King, "were promiscuously classed<br />
under one head by the ignorance of the Middle Ages (unacquainted<br />
with even the ancient test of hardness) whence has arisen that<br />
strange interchange of names between ancient and modern precious<br />
stones so perplexing to every mineralogist."<br />
"Garnet," according to the best authorities, is derived from<br />
pomegranate, because of the resemblance of its color to the jelly-like<br />
juice surrounding the seeds of that fruit. This is quite as applicable<br />
to the ruby, which was also included with the "Granatica," and the<br />
spinel. At an earlier date, they were all grouped under the general<br />
head of carbunculus, from carbo, a coal, because of their supposed resemblance<br />
to burning coal. The modern carbuncle, which is never a<br />
specific gem, but always a garnet cut convex, exemplifies this idea to<br />
a marked degree, particularly when placed in the direct rays of the<br />
sun. Usually, such a stone is cut en cabochon, hollowed out<br />
though as garnet is brittle, it is safer to have the flat bottom and<br />
set against a background of convex gold. This was a favorite treatment<br />
for centuries, and is considered artistic at the present time.<br />
Wily Asiatics often place colored foil at the back to improve a tint,<br />
and deceive the purchaser. It is not safe to buy in the Orient any<br />
jewel set with closed back unless the dealer is known as reliable.<br />
"En cabochon" is the French expression for the convex, polished<br />
but uncut. While carbuncle usually means garnet mounted in<br />
this manner, the term is applied to any stone so cut; which is best<br />
for all dark or badly flawed specimens, throwing light into their<br />
depths, making them sometimes more brilliant by night than day.<br />
The garnet family is divided into six or more sub-species, which<br />
pass into each other by almost imperceptible gradations. They are<br />
all silicates of different protoxides or peroxide, combined with alum-<br />
ina, the variations causing the difference in hardness and color, as :<br />
the alumina-lime garnet, of which the essonite is an example ; alumina-magnesia<br />
garnet, otherwise the Bohemian pyrope; alumina-iron<br />
garnet, as the almandine ; alumina-manganese garnet, the spessartite,<br />
from Amelia Court House, Virginia ; iron-lime garnet, the black and<br />
a variety of the common kind; lime-chrome garnet, the emeraldgreen<br />
ouvarovite of Siberia.<br />
Garnets are easily melted by the blowpipe and some varieties,<br />
as the black garnet or melanite, found in the lavas of Vesuvius, seem<br />
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