mineral

Polished moss agate pendant

Moss agate, a chalcedony variety of microcrystalline quartz (SiO₂), with green chlorite/actinolite inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent to opaque green, cream, and brown, with vitreous-to-waxy luster and no visible cleavage. The elongated polished cabochon is likely capped with a metal bail and may be coated or treated.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits chalcedony in cavities and fractures, trapping dendritic green mineral inclusions; commonly associated with volcanic rocks, generally formed during the host rock’s later alteration rather than one specific age.

Uses & applications

Used for cabochons, pendants, beads, and ornamental objects; modest value depends on translucency, attractive patterning, polish, and workmanship.

Geological facts

Despite its name, moss agate is not true agate in the strictly banded sense and contains no biological moss; its plant-like patterns are mineral inclusions.

Field identification & locations

Identify by its glassy polish, waxy translucency, hardness, and moss-like internal markings; common sources include India, Brazil, Uruguay, the United States, and Australia. Avoid confusing it with dyed quartz or plastic imitations.