mineral
Tumbled reddish jasper
Microcrystalline quartz (SiO₂), commonly colored by iron oxides
AI-generated identification · may be incorrectOpaque reddish-brown, fine-grained, earthy to waxy luster, with subtle mottling and no visible cleavage; quartz hardness is about 6.5–7 Mohs and specific gravity about 2.6. The rounded, smooth shape indicates human tumbling or natural abrasion.
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Physical properties
Opaque reddish-brown, fine-grained, earthy to waxy luster, with subtle mottling and no visible cleavage; quartz hardness is about 6.5–7 Mohs and specific gravity about 2.6. The rounded, smooth shape indicates human tumbling or natural abrasion.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement sediment, volcanic material, or other rocks, with iron oxides producing the red color. Deposits occur in many ages and settings, especially volcanic and sedimentary environments.
Uses & applications
Used as an ornamental stone, cabochons, beads, carvings, lapidary pieces, and decorative aggregate; it has little industrial value.
Geological facts
Jasper is a variety of chalcedony or microcrystalline quartz, although some specimens contain abundant impurities and hematite. Red jasper is valued for its warm color and patterns rather than transparency.
Field identification & locations
Identify it by its opaque red-brown color, fine texture, lack of cleavage, and inability to scratch it with a steel knife easily; a quartz crystal or glass can scratch it. Common sources include India, Madagascar, Brazil, Australia, and the United States.
