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JASPER.
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violet, and green are found abundantly ; the latter being most common. When it is green spotted with red, it constitutes sanguineous jasper, the value of which increases according to the quantity and fineness of the red spots on it.
India,
so rieh in gems, furnishes the most beautiful of these. Some, of
inferior quality, are found in Bohemia, Saxony, Siberia, England,
Italy, and France.
Generally speaking, every jasper gives by analysis
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The
specific weight of jaspers varies from 2-5630 to 2-7640, and between
these two extremes may be collected twenty-one different species of
jasper, each of which is mixed with heterogeneous materials, which,
imparting to them different colours? cause them to bear different
names. The twenty-one species are always ranged under seven principal
divisions, as follows :
1.
Sanguineous Jasper.—This is recognised by its opaque ground, of a
bright green, marked with spots of red, purple, pink, or brown. It was
much prized by the ancients, who attributed to it anti-hemorrhagic and
anti-apoplectic virtues. Even now it is much sought as very suitable
for being engraved on.
2. Egyptian Jasper.—This includes two species, red and brown ; and is marked with zones. It constitutes
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