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Color: Chalcedony can be virtually any
color of the rainbow. It is commonly pale blue,
yellow, brown or gray with nearly waxlike luster. A
white, buff, or light tan species of chalcedony are
also occured.
Description: SiO2 Chalcedony is a finely
crystallized or fibrous quartz that forms rounded
crusts, rinds, or stalactites in volcanic and
sedimentary rocks. Chalcedony is a precious stone
that occurs in many forms, colors, and shapes.
Chalcedony, agates, jaspers, bloodstone, cornelian,
onyx, and chrysoprase all make up the chalcedony
gemstones. Chalcedonic pseudomorphs after other
minerals often give rise to very interesting
specimens.
Other physical properties are those of quartz.
Care and treatment: Protect chalcedony from
scratches, sharp blows, harsh chemicals and extreme
temperatures.
From the stone history: The Romans prized chalcedony
as seals, and the Victorians carved them into an
endless array of cameos and intaglios. Chalcedony
was used in Renaissance magic for health and safety.
In all ages chalcedony has been the stone most used
by the gem engraver, and many colored varieties are
still cut and polished as ornamental stones. |
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