metamorphic
Polished reddish banded jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque red-brown with black/gray flow-like banding, waxy to vitreous luster, cryptocrystalline structure, and no visible cleavage. The smooth rounded surface indicates natural water wear or polishing.
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Physical properties
Hardness about 6.5–7 Mohs; opaque red-brown with black/gray flow-like banding, waxy to vitreous luster, cryptocrystalline structure, and no visible cleavage. The smooth rounded surface indicates natural water wear or polishing.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic sediment and incorporate iron oxides; its exact age depends on source, commonly Precambrian to younger. Red coloration comes chiefly from hematite or other iron oxides.
Uses & applications
Used for cabochons, carvings, ornaments, countertops, and inexpensive collector specimens. This rounded piece has modest decorative value.
Geological facts
Jasper is a variety of chert distinguished by abundant impurities and opacity; patterns may resemble landscapes or flames. The specimen may also be marketed as red jasper or brecciated/flow jasper, though exact variety is uncertain visually.
Field identification & locations
Identify by its opaque red color, black patterning, glass-scratching hardness, and lack of fizz in dilute acid. Common sources include India, Madagascar, Brazil, Australia, and the western United States.
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