sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness: 6.5-7 on the Mohs scale. Color: Olive green to deep forest green with mottled/swirled patterns. Luster: Waxy to vitreous. Crystal structure: Microcrystalline/cryptocrystalline (trigonal system). Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.9.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Olive green to deep forest green with mottled/swirled patterns. Luster: Waxy to vitreous. Crystal structure: Microcrystalline/cryptocrystalline (trigonal system). Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.9.
Formation & geological history
Formed when microcrystalline quartz precipitates together with iron silicate minerals such as chlorite or actinolite during hydrothermal activity or silica accumulation in marine environments.
Uses & applications
Widely used for lapidary arts, cabochons, carved ornaments, tumbling, and decorative jewelry.
Geological facts
Green jasper was historically highly valued in ancient civilizations. In medieval times, green jasper was believed to ward off evil spirits and bring rain.
Field identification & locations
Can be identified in the field by its smooth, waxy surface when water-worn, distinct opaque green color, and resistance to scratching with steel. Commonly found on beaches, riverbeds, and gravel deposits worldwide.
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