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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...
- Jasper, an
aggregate of
microgranular quartz and/or
cryptocrystalline chalcedony and
other mineral phases, is an opaque,
impure variety of silica, usually...
- AG-it) is a
banded variety of
chalcedony.
Agate stones are
characterized by
alternating bands of
different colored chalcedony and
sometimes include macroscopic...
- "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...
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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...
- sard is a red-orange,
translucent variety of
chalcedony.
Jasper is an
opaque chert or
impure chalcedony. Pure quartz,
traditionally called rock crystal...
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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...
- 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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chrysocolla may be a
mixture of the
copper hydroxide spertiniite and
chalcedony.
Chrysocolla typically forms amorphously. The name
chrysocolla comes from...
