mineral
Iron-rich river pebble, possibly hematite-bearing jasper
Hematite-bearing jasper; chiefly microcrystalline quartz (SiO₂) with iron oxides, especially hematite (Fe₂O₃)
AI-generated identification · may be incorrectDark reddish-brown, opaque, and earthy to submetallic with irregular conchoidal surfaces; likely hardness 6–7 (quartz-rich) and specific gravity roughly 2.6–3.5. The rounded shape indicates water abrasion; no obvious cleavage or visible crystal structure.
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Physical properties
Dark reddish-brown, opaque, and earthy to submetallic with irregular conchoidal surfaces; likely hardness 6–7 (quartz-rich) and specific gravity roughly 2.6–3.5. The rounded shape indicates water abrasion; no obvious cleavage or visible crystal structure.
Formation & geological history
Formed from silica-rich material colored by oxidized iron, commonly through sedimentary or hydrothermal processes, then weathered and rounded in a stream or coastal environment. Its precise geological age cannot be determined from the image.
Uses & applications
Used as a lapidary material, ornamental stone, pigment source, and occasionally as a low-grade iron ore; attractive pieces may be polished for cabochons or display.
Geological facts
A red streak on unglazed ceramic supports hematite or iron-oxide content; jasper typically gives a white-to-light streak. Magnetism, if present, would suggest magnetite rather than ordinary hematite.
Field identification & locations
Common in iron-rich terrains and gravel beds worldwide, including India, Brazil, Australia, and the western United States. Test with a steel file, streak plate, and magnet; avoid acid testing unless necessary.
