mineral

Tumbled moss agate

Chalcedony (microcrystalline quartz, SiO₂) with moss-like inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent milky-white to gray body with dark green, possibly brown iron/manganese-oxide inclusions; waxy to vitreous luster, cryptocrystalline structure, no cleavage, specific gravity about 2.60.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits chalcedony in cavities and fractures, trapping dendritic inclusions—commonly chlorite, hornblende, or iron oxides. The specimen is polished/tumbled; its exact geological age cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and inexpensive collector specimens; generally not used as a major construction stone.

Geological facts

Despite the name, moss agate is usually not true agate banding and contains no organic moss. Its patterns are mineral inclusions revealed by translucent chalcedony.

Field identification & locations

Identify by its waxy translucent quartz body, curved polish, and branching green inclusions; common sources include India, Brazil, Uruguay, the United States, and Central Europe. A scratch test should be avoided on polished pieces.