mineral

Green Chalcedony (Green Agate)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 Mohs; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Monoclinic (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.65

Hardness: 6
Color: Translucent to opaque green
Luster: Vitreous to waxy

Identified May 23, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Monoclinic (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.65

Formation & geological history

Formed through the deposition of silica from groundwater in cavities of volcanic and sedimentary rocks. Common in hydrothermal veins and as nodules in volcanic rocks.

Uses & applications

Primarily used in jewelry as cabochons, ring stones, and beads. Also used for ornamental carvings, seals, and as a collector's gemstone.

Geological facts

The green color is typically caused by trace amounts of nickel or chromium, or sometimes intentional heat treatment and dyeing. It has been used since antiquity for amulets and signet rings.

Field identification & locations

Look for a characteristic waxy luster and conchoidal fracture. In Indonesian markets (where this photo likely originates), it is often referred to as 'Batu Akik Green Baron' or 'Pandan'. Common locations include Brazil, Uruguay, India, and Indonesia.

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