mineral
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂) colored by iron oxides
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7; opaque brick-red to orange, earthy-to-waxy luster, very fine-grained microcrystalline structure, and no visible cleavage. The rounded shape indicates mechanical tumbling and polishing.
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Physical properties
Typically Mohs hardness 6.5–7; opaque brick-red to orange, earthy-to-waxy luster, very fine-grained microcrystalline structure, and no visible cleavage. The rounded shape indicates mechanical tumbling and polishing.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement fine sediments, incorporating iron oxides that produce the red color; deposits range from Precambrian to younger ages. Common sources include India, Brazil, Madagascar, and the western United States.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and decorative objects; less commonly as aggregate or ornamental stone.
Geological facts
Its red coloration is mainly hematite or related iron-oxide inclusions. Jasper is a variety of chalcedony or microcrystalline quartz, though the term is often used broadly for opaque silica-rich stones.
Field identification & locations
Identify it by its opaque red-orange color, fine texture, glass scratch resistance, and lack of cleavage; a streak test may be pale red-brown. The image alone cannot exclude dyed or coated material.
