mineral

Moss Agate

Chalcedony (Silicon Dioxide) with Chlorite or Iron/Manganese inclusions (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: White, gray, or clear base with green moss-like inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture)

Hardness: 6
Color: White, gray, or clear base with green moss-like inclusions
Luster: Vitreous to waxy

Identified July 7, 2026More mineral →

Explore Moss Agate 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

Formed via the weathering of volcanic rocks where silica-rich groundwater fills cavities and cracks, depositing minerals that solidify over millions of years along with mineral inclusions that create plant-like patterns.

Uses & applications

Primarily used as a gemstone for jewelry, ornamental carvings, and as a popular metaphysical or decorative specimen for collectors.

Geological facts

Despite its name, it does not contain plant matter; the 'moss' is actually dendritic minerals. It has been used since the 18th century as a stone of good fortune and agricultural abundance.

Field identification & locations

Identify in the field by its translucent white or clear quartz body featuring green, branch-like mineral patterns. Commonly found in India, Brazil, Uruguay, and the United States (Montana/Oregon).

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Granite

Granite (Phaneritic intrusive igneous rock)

igneous