mineral
Green Jasper (or Moss Agate / Prase)
Silicon Dioxide (SiO2) with chlorite or amphibole inclusions
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
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Physical properties
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.
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.
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