mineral
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides
AI-generated identification · may be incorrectMohs hardness 6.5–7; opaque brick-red to reddish brown with pale veins, vitreous to waxy polish, and no visible cleavage. Microcrystalline quartz; specific gravity about 2.6.
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Physical properties
Mohs hardness 6.5–7; opaque brick-red to reddish brown with pale veins, vitreous to waxy polish, and no visible cleavage. Microcrystalline quartz; specific gravity about 2.6.
Formation & geological history
Forms as silica-rich chalcedony that becomes colored by iron-bearing minerals, often filling cavities or replacing material in volcanic rocks. Its age depends on the deposit and cannot be determined from the image.
Uses & applications
Used for cabochons, beads, carvings, and decorative objects; jasper is also collected as a polished specimen.
Geological facts
Jasper is a trade name for opaque, patterned chalcedony; the visible banding or veins can help distinguish varieties.
Field identification & locations
Look for an opaque, silica-hard stone with red coloration and irregular patterns; common sources include India, Brazil, Madagascar, and the western United States. The polished, water-wet appearance limits identification of its exact variety.
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