mineral
Red jasper pebble
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque reddish-orange, earthy to dull luster, massive cryptocrystalline structure, no visible cleavage, conchoidal-to-uneven fracture; Mohs hardness about 6.5–7 and specific gravity 2.55–2.70.
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Physical properties
Opaque reddish-orange, earthy to dull luster, massive cryptocrystalline structure, no visible cleavage, conchoidal-to-uneven fracture; Mohs hardness about 6.5–7 and specific gravity 2.55–2.70.
Formation & geological history
Forms when silica-rich fluids cement or replace sediments and volcanic materials, with hematite or goethite producing the red color. Deposits occur in many ages, commonly in hydrothermal, volcanic, and sedimentary environments.
Uses & applications
Used as a lapidary stone for cabochons, beads, carvings, and polished décor; less commonly used as aggregate. Small rough pieces have modest collecting value.
Geological facts
Jasper is a variety of chalcedony or microcrystalline quartz, though its opaque, impurity-rich composition distinguishes it from translucent agate. The pictured piece may also be iron-rich chert or another red silica rock.
Field identification & locations
Identify it by its opaque red color, very fine texture, lack of cleavage, and ability to scratch ordinary glass; a streak test is typically white to pale brown. Common sources include India, Madagascar, Brazil, the western United States, and Australia.
