Explore: Chalcedony

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

sard is a red-orange, translucent variety of chalcedony. Jasper is an opaque chert or impure chalcedony. Pure quartz, traditionally called rock crystal

"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

Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small quantities of nickel

jasper (opaque) or sometimes as chalcedony (translucent). The "classic" bloodstone is translucent to opaque green chalcedony and red jasper that contains

English word "nail" is cognate with the Greek word. Onyx is formed of chalcedony bands in alternating colors. It is cryptocrystalline, consisting of fine

quartz, smoky quartz, hematite, pyrite, fluorite, goethite, agate and chalcedony. Amethyst is a violet variety of quartz (SiO2) and owes its violet color