metamorphic
Tumbled green jasper (likely ocean or rainforest jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron- and other mineral inclusions
AI-generated identification · may be incorrectOpaque olive-green to brown, mottled, and smoothly polished with a waxy to vitreous luster; quartz hardness is about 6.5–7 Mohs, with no visible cleavage. Its fine-grained structure is cryptocrystalline rather than visibly crystalline; the exact variety cannot be confirmed from the image alone.
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Physical properties
Opaque olive-green to brown, mottled, and smoothly polished with a waxy to vitreous luster; quartz hardness is about 6.5–7 Mohs, with no visible cleavage. Its fine-grained structure is cryptocrystalline rather than visibly crystalline; the exact variety cannot be confirmed from the image alone.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rocks, incorporating iron and clay minerals; formation ages vary widely from Precambrian to younger. This specimen has been cut and tumbled, so its natural texture is obscured.
Uses & applications
Used for cabochons, beads, carvings, and decorative objects; common polished pieces have modest jewelry and collecting value.
Geological facts
Green coloration commonly reflects chlorite, epidote, actinolite, or iron-bearing inclusions. “Ocean jasper” is a trade name for orbicular jasper, while “rainforest jasper” commonly refers to rhyolitic material marketed as jasper.
Field identification & locations
Identify by its opaque mottled pattern, glass-scratching hardness, and lack of fizz in dilute acid; it is not reliably distinguishable from other green jaspers visually. Common sources include Madagascar, Australia, Brazil, India, and the United States.
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