metamorphic
Polished zebra jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and manganese-rich banding
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque, fine-grained, waxy to vitreous luster, with cream, gray, and dark brown-black flowing bands. It has no visible crystals or cleavage and is commonly shaped and polished as a cabochon or palm stone.
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Physical properties
Hardness about 6.5–7 Mohs; opaque, fine-grained, waxy to vitreous luster, with cream, gray, and dark brown-black flowing bands. It has no visible crystals or cleavage and is commonly shaped and polished as a cabochon or palm stone.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement sediments, with iron and manganese oxides producing the bands; later alteration and silicification create the patterns. Exact age and locality cannot be determined from the image; zebra jasper is commonly associated with Precambrian volcanic-sedimentary terrains.
Uses & applications
Used for cabochons, carvings, beads, palm stones, and decorative objects; it has modest lapidary and collector value rather than major gemstone rarity.
Geological facts
The name “zebra jasper” is a commercial pattern name applied to several banded jaspers, not one precisely defined mineral species.
Field identification & locations
Identify it by its opaque, very fine-grained texture, strong contrasting bands, and ability to take a high polish; it should not fizz in dilute acid. Common sources include India, Madagascar, Mexico, and Africa.
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