DigMyGem Gem encyclopedia

White Chalcedony

Quartz & Crystal Family

White chalcedony is a color description, not a distinct mineral species. It is white to milky fibrous microcrystalline silica composed mainly of quartz with some moganite, commonly showing a dense texture, waxy luster, and translucent edges.

Identity

Material or variety
Chalcedony
Scientific or material identity
Chalcedony (microcrystalline quartz)
Classification
Natural mineral or mineral variety
Composition or formula
SiO₂
Crystal system or structure
Aggregate or composite structure
Geological or manufacturing origin
Forms from silica- or mineral-rich fluids in cavities and fractures.
Mohs hardness
6.5 to 7
Specific gravity
2.58 to 2.64

Origins

Brazil · Iceland · India · Mexico · Namibia · Russia · USA

Appearance & optical properties

opaque-to-translucent milky white chalcedony.

History & discovery

The name chalcedony comes from Latin chalcedonius and has traditionally been linked, though not with certainty, to the ancient town of Chalcedon in Asia Minor. A surviving Roman ring from the first half of the first century CE shows that pale chalcedony was already being carved as a gem material.

Uses & care

Common uses
Tough, evenly colored chalcedony is cut into cabochons for jewelry and carved into beads, seals, cameos, small figures, and ornamental objects.
Handling and cleaning
Clean with warm water, mild detergent, and a soft brush. Store it away from harder stones to prevent scratches, and use gentler cleaning if the piece has fractures or delicate carving.

Jewellery

5 pieces of White Chalcedony jewellery. Learners earn each one in DigMyGem by learning words; until then it shows as a silhouette.

  • Silhouette of Pale Moon Cameo

    Pale Moon Cameo

    Brooch

    Chalcedony has been carved into cameos since antiquity for its smooth, even surface. This imagined cameo keeps that classical habit.

  • Silhouette of Mist Dove Pendant

    Mist Dove Pendant

    Pendant

    An imagined pendant shaped like folded wings around a milky stone. White chalcedony takes a soft clouded polish that suits the idea.

  • Silhouette of Cloudveil Ring

    Cloudveil Ring

    Ring

    An imagined ring with a flat white stone set flush into the band. The cloudy surface is the stone's own quiet beauty.

  • Silhouette of Spring Flowers Egg

    Spring Flowers Egg

    Jewel

    A jewelled Easter egg attributed to Peter Carl Fabergé, dated about 1890 and now in the Fabergé Museum in Saint Petersburg. Inside is a platinum basket of flowers carved from white chalcedony and garnets.

  • Silhouette of Moonmilk Lily Brooch

    Moonmilk Lily Brooch

    Brooch

    An imagined brooch of a lily carved from milky white chalcedony, the stone Byzantine craftsmen carved for seals and cups. Its petals glow softly when light passes through them.

Sources