gemstone

Moss agate bracelet

Chalcedony (microcrystalline quartz, SiO₂) with chlorite/amphibole inclusions

AI-generated identification · may be incorrect

Polished spherical beads with dark green, black, and reddish-pink inclusions; vitreous to waxy luster, no visible cleavage, hardness about 6.5–7 Mohs, specific gravity approximately 2.6. The pattern is dendritic or plume-like rather than true moss.

Identified August 12, 2026More gemstone →

Explore Moss agate bracelet in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rock, with iron and manganese oxides plus green minerals producing inclusions. Chalcedony deposits are commonly Cenozoic to older volcanic-hosted materials; exact age requires provenance.

Uses & applications

Used for beads, cabochons, carvings, and inexpensive jewelry; valued mainly for attractive natural patterning and polish.

Geological facts

Despite its name, moss agate is not a true agate banding variety and contains no organic moss. Red areas commonly reflect iron oxides, while green areas may contain chlorite or hornblende.

Field identification & locations

Identify by translucent gray-to-green chalcedony, branching or cloudlike inclusions, glassy polish, and lack of cleavage; it should resist scratching by a steel knife. Common sources include India, Brazil, Uruguay, the United States, and Madagascar.