chalcedony

Translucent silica mineral

Chalcedony is a type of quartz with a waxy luster and fine crystalline structure, occurring in many colors and forms.

Agate, onyx, carnelian, and jasper are all varieties of chalcedony.

The stone has been used since antiquity for jewelry and decorative carvings: a chalcedony seal, chalcedony beads.

gemstone

agate

Banded semiprecious stone

carnelianReddish-brown translucent quartz
onyxLayered black-white gemstone
jasperOpaque colored quartz

chrysoprase · bloodstone · sardonyx · heliotrope · cabochon · pendant · bezel · jewelry · lapidary · carat

varieties

agate

Banded semiprecious stone

carnelianReddish-brown translucent quartz
onyxLayered black-white gemstone
jasperOpaque colored quartz

chrysoprase · bloodstone · sardonyx · heliotrope · fire agate · plasma · flint · chert · petrified wood · tiger eye

appearance

translucent

Permitting diffused light passage

waxyResembling paraffin's texture
bandedHaving encircling marks
milkyWhitish and cloudy

cloudy · mottled · variegated · veined · streaked · iridescent · smoky · frosted · vitreous · layered

mineral

quartz

Crystalline silicon dioxide

silicaSilicon dioxide compound
geodeCrystal-lined rock cavity
hardnessResistance to penetration

specimen · geology · mineralogy · rockhound · formation · aggregate · sedimentary · crystal · nodule · deposit

Categories

materialsmetal, metals, wood, ceramic, fabric
gemstone colorsruby red, emerald green, sapphire blue, amber, turquoise
gemstonesdiamond, ruby, emerald, sapphire, pearl
stonestone, rock, boulder, pebble, slab
quartz varietiesquartz, amethyst, citrine, rose quartz, smoky quartz
hydrothermal mineralspyrite, quartz, galena, calcite, barite

Opposites

crystal structure

chalcedonyrock crystal

Colorless transparent quartz

amethyst · citrine · smoky quartz · rose quartz · glass

formation habit

chalcedonyprismatic crystals

Faceted solids splitting light

Family

microcrystalline

Familiarity: Top 1,000,000
Profile: Used worldwide · Timeless · Concrete · Rated G