gemstone
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, translucent to opaque transparency, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity around 2.58 to 2.64.
Identified More gemstone →
Explore Moss Agate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, translucent to opaque transparency, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity around 2.58 to 2.64.
Formation & geological history
Formed from weathering of volcanic or metamorphic rocks where silica-rich groundwater fills cavities and fissures, depositing microscopic quartz crystals along with green hornblende, chlorite, or other dendrite-forming minerals.
Uses & applications
Widely used in jewelry making, as tumbled stones, for decorative carvings, and highly prized by mineral and crystal collectors.
Geological facts
Despite its name, moss agate does not contain any organic matter; the 'mossy' or dendritic patterns are actually mineral impurities like manganese or iron oxides that resemble plant growth.
Field identification & locations
Easily identified visually by its translucent chalcedony body filled with green, fern-like or moss-like inclusions. Found globally, notably in India, the United States, Brazil, and Australia.
More like this
Other gemstone specimens
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Topaz
Al2SiO4(F,OH)2
mineral
Amber
Succinite (Organic Gemstone)
mineral
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary