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Chalcedony (/kælˈsɛdəni/ kal-SED-ə-nee, or /ˈkælsəˌdoʊni/ KAL-sə-doh-nee) is a
cryptocrystalline form of silica,
composed of very fine
intergrowths of...
- the parallel-banded
variety of
chalcedony, an
oxide mineral.
Agate and onyx are both
varieties of
layered chalcedony that
differ only in the form of...
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Chrome chalcedony is a
green variety of the
mineral chalcedony,
colored by
small quantities of chromium. Its name is
derived from Mutorashanga, a small...
- Jasper, an
aggregate of
microgranular quartz and/or
cryptocrystalline chalcedony and
other mineral phases, is an opaque,
impure variety of silica, usually...
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Agate (/ˈæɡɪt/ AG-it) is the
banded variety of
chalcedony,
which comes in a wide
variety of colors.
Agates are
primarily formed within volcanic and metamorphic...
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context of
rings usually refers to a ring set with a
chalcedony stone. Well-known
types of
chalcedony are carnelian, agate, and onyx. It is
considered a...
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valid species:
Adamantine spar (variety of corundum)
Agate (variety of
chalcedony and quartz)
Alabaster (variety of gypsum)
Alexandrite (variety of chrysoberyl)...
- speaking,
grape agate is not an
agate and is
actually botryoidal purple chalcedony. It
occurs in
Indonesia and has also been
found west of the
Green river...
- interchangeably. Both
carnelian and sard are
varieties of the
silica mineral chalcedony colored by
impurities of iron oxide. The
color can vary greatly, ranging...
- Chrysoprase,
chrysophrase or
chrysoprasus is a
gemstone variety of
chalcedony (a
cryptocrystalline form of silica) that
contains small quantities of nickel...
