mineral

Moss Agate with Jasper

Chalcedony (SiO2 with inclusions)

Hardness: 6.5-7 Mohs; Color: Gray, white, yellow, and dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture).

Hardness: 6
Color: Gray, white, yellow, and dark green
Luster: Vitreous to waxy

Identified June 3, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Gray, white, yellow, and dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture).

Formation & geological history

Forms through the deposition of silica from groundwater in cavities of igneous rocks. The dendritic or moss-like inclusions are typically manganese or iron oxides.

Uses & applications

Primarily used in jewelry (cabochons), ornamental carvings, and as a popular specimen for rock collectors.

Geological facts

Despite its name, moss agate is not organic and does not contain actual moss; the patterns are strictly mineral growths. It has been used since ancient times as a stone of harmony and agriculture.

Field identification & locations

Identify in the field by its translucent body with opaque, branching inclusions and its ability to scratch glass. Commonly found in riverbeds and volcanic regions of India, Brazil, and the USA (Montana).

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