aggregate of microquartz and/or chalcedony and other mineral phases,
is an opaque, mpure variety of silica, usually red, yellow, brown or
green in color; and rarely blue. The common red color is due to iron
inclusions. The mineral aggregate breaks with a smooth surface and is
used for ornamentation or as a gemstone. It can be highly polished
and is used for vases, seals, and snuff boxes.
This necklace has a lobster clasp and is adjustable from 19 inches to 21 inches.