igneous
Green Jasper / Metavesuvianite-bearing rock
Silica-rich microcrystalline quartz aggregate / Green Jasper
Hardness of 6.5 to 7 on the Mohs scale, mottled green and brownish coloration with a waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture, and specific gravity around 2.58 - 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, mottled green and brownish coloration with a waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture, and specific gravity around 2.58 - 2.91.
Formation & geological history
Formed via the precipitation of silica-rich fluids in fractures and cavities of volcanic or sedimentary rocks, often associated with hydrothermal activity or low-grade metamorphism over millions of years.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, cabochons for jewelry, and as a collectible geological specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry. The green variety is often colored by iron silicates, chlorite, or chromium impurities.
Field identification & locations
Easily identifiable in the field by its distinct green color, high hardness (scratches glass), and waxy luster. Commonly found in riverbeds, glacial tills, and areas with past volcanic or hydrothermal activity.
