metamorphic
Red jasper pebble (probable)
Jasper; microcrystalline quartz (SiO₂) colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque brick-red to brown, earthy-to-dull waxy luster, massive with no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The rounded shape indicates natural water abrasion or tumbling.
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Physical properties
Opaque brick-red to brown, earthy-to-dull waxy luster, massive with no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The rounded shape indicates natural water abrasion or tumbling.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement sediments and volcanic material, with hematite/goethite producing the red color; its exact age depends on locality, commonly Precambrian to younger. The image alone cannot establish a precise geological age.
Uses & applications
Used as an ornamental and lapidary stone for cabochons, carvings, beads, bookends, and polished specimens; it has little industrial value.
Geological facts
Jasper is a variety of chalcedony or microcrystalline quartz, though many specimens contain impurities and iron-rich inclusions. Red color generally reflects finely disseminated hematite.
Field identification & locations
Common in volcanic and sedimentary terrains worldwide, including India, Madagascar, Brazil, Australia, and the western United States. Check for hardness against glass, a white streak, lack of cleavage, and red-brown iron-rich patterning; positive identification may require testing.
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