description Chalcedony Overview
Chalcedony is a cryptocrystalline or microcrystalline form of silica composed mainly of intergrown quartz and moganite. It is commonly translucent, with a waxy luster, and occurs in many colors; banded material is usually called agate, while related varieties include carnelian, chrysoprase, and onyx. Because it is compact and takes a polish, chalcedony has been used for beads, seals, cameos, and engraved gems since antiquity.
help Chalcedony FAQ
What is chalcedony made of?
Chalcedony is a microcrystalline form of silica made mainly from intergrown quartz and moganite. Its crystals are too small to see easily without magnification.
How is chalcedony different from agate?
Chalcedony is a broad material name, while agate usually refers to chalcedony with visible bands or layers. Carnelian is a reddish-orange variety, and chrysoprase is a green variety colored by nickel.
What colors can chalcedony be?
Chalcedony can be white, gray, blue, brown, orange, red, green, or nearly black. It commonly has a translucent appearance and a waxy luster.
How hard is chalcedony?
Chalcedony has the durability expected of quartz, with a Mohs hardness of about 7. That makes it suitable for cabochons, beads, carvings, and other jewelry uses.
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