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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 quartz...
- fibrous,
banded variety of
chalcedony.
Agate stones are
characterized by
alternating bands of
different colored chalcedony and
sometimes include macroscopic...
- Jasper, an
aggregate of
microgranular quartz and/or
cryptocrystalline chalcedony and
other mineral phases, is an opaque,
impure variety of silica, usually...
- "Hist. nat.", 37, liv). The
banded agate belongs to the
silex family (
chalcedony species) and is
formed by
deposits of
siliceous beds in
hollows of rocks...
-
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...
- sard is a red-orange,
translucent variety of
chalcedony.
Jasper is an
opaque chert or
impure chalcedony. Pure quartz,
traditionally called rock crystal...
- Fire
agate is a
variety of
chalcedony that
displays fire-like
iridescent flashes. It is
found only in
certain areas of
central and
northern Mexico and...
- interchangeably. Both
carnelian and sard are
varieties of the
silica mineral chalcedony colored by
impurities of iron oxide. The
color can vary greatly, ranging...
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English word "nail" is
cognate with the Gr**** word. Onyx is
formed of
chalcedony bands in
alternating colors. It is cryptocrystalline,
consisting of fine...
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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)...
