mineral
Tumbled yellow jasper
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7, opaque yellow-orange, earthy to waxy luster, and no visible crystals or cleavage; specific gravity about 2.6. The rounded shape indicates tumbling or natural water-wear.
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Physical properties
Typically Mohs hardness 6.5–7, opaque yellow-orange, earthy to waxy luster, and no visible crystals or cleavage; specific gravity about 2.6. The rounded shape indicates tumbling or natural water-wear.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement fine-grained sediments, often with iron-oxide staining; deposits range from Precambrian to much younger ages. Common sources include volcanic and sedimentary terrains worldwide.
Uses & applications
Used for cabochons, beads, carvings, ornamental objects, and lapidary collections; its toughness makes it suitable for polishing rather than high-end faceting.
Geological facts
Yellow coloration generally reflects goethite or limonite inclusions. Jasper is technically an opaque variety of chalcedony or microcrystalline quartz, although trade names often cover several similar rocks.
Field identification & locations
Identify it by its opaque, uniform fine texture, strong polish, and resistance to scratching with steel; quartz crystal, agate banding, or translucent edges would suggest a related material. Common locations include Brazil, India, Madagascar, Indonesia, and the United States.
