mineral

Green Jasper (or Moss Agate / Prase)

Silicon Dioxide (SiO2) with chlorite or amphibole inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Deep forest green to dark teal-green with waxy to vitreous luster. Structure: Microcrystalline/cryptocrystalline quartz. Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.65.

Hardness: 6

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Forms in low-temperature hydrothermal environments and silica-rich fluids filling cavities in volcanic rocks, taking on its rich green color from inclusions of iron-rich silicates like chlorite, actinolite, or celadonite.

Uses & applications

Popular for lapidary work, gemstones, cabochons, carved ornaments, decorative polished stones, and spiritual/crystal collecting.

Geological facts

Green jasper has been prized since antiquity; in ancient Egypt, Mesopotamia, and Greece, dark green jasper specimens were carved into amulets and seals.

Field identification & locations

Identified by its waxy-to-glassy luster, deep green color, smooth conchoidal fractures, and hardness (cannot be scratched by a steel nail). Commonly found in India, Brazil, Madagascar, South Africa, and the western United States.