Top Results for Chalcedony

Blue lace agate is a variety of chalcedony, a microcrystalline form of quartz, recognized by pale blue to blue-gray bands that can form delicate, lace-like patterns. It is commonly cut and polished for cabochons, beads, and other ornamental uses rather than faceted as a transparent gem. Material fro...

Iris agate is a finely banded variety of agate, a form of chalcedony, whose microscopic layers can produce a rainbow effect through diffraction. The effect depends on sufficiently thin, closely spaced bands and is usually visible when a properly cut section is illuminated from behind, allowing light...

Crazy Lace Agate is a commercial name for a patterned form of banded chalcedony associated mainly with Chihuahua, Mexico. It is distinguished by intricate, irregular lace-like bands and swirls that may combine red, orange, yellow, white, gray, and brown tones. The material is used in lapidary work a...

Sard is a reddish-brown to brown variety of chalcedony, the microcrystalline form of quartz. Its color is associated with iron compounds, and it grades into the related stone carnelian, which is generally more orange or red. Sard was used in ancient seals, engraved gems, intaglios, and cameos becaus...

Chrysoprase is a translucent green variety of chalcedony, which is a microcrystalline form of quartz. Its color is caused mainly by small amounts of nickel-bearing minerals dispersed through the silica, and the shade can range from pale green to a stronger apple green. It is cut into cabochons, bead...

Dendritic agate is a variety of chalcedony, a microcrystalline form of quartz, that is typically colorless, white, gray, or translucent. Its defining feature is the presence of branching, fern-like patterns formed by mineral inclusions, commonly involving manganese or iron oxides. It is used mainly...

Moss agate is a variety of chalcedony, a microcrystalline form of quartz, containing green, brown, or black inclusions that can resemble moss, branches, or other plant forms. The inclusions are usually mineral material rather than fossilized vegetation and create patterns that vary from stone to sto...

Carnelian is a translucent variety of chalcedony, a microcrystalline form of quartz, with colors ranging from orange and reddish orange to brownish red. Its color is commonly linked to iron impurities, and the stone can be polished or carved into beads, seals, and other objects. Carnelian was used w...

Bloodstone, also called heliotrope, is a dark green variety of chalcedony marked by red spots or patches caused by iron oxide minerals. The contrast between the green base and red inclusions is its defining visual feature. It has been collected and used for carved objects and jewelry for centuries,...

Agate is a variety of chalcedony, the microcrystalline form of quartz, usually recognized by bands or other patterns created as silica layers fill a cavity in volcanic or other rock. Its colors and translucency come from fine mineral impurities and changes during deposition, so specimens may show co...