mineral
Red jasper (likely brecciated jasper)
Microcrystalline quartz, SiO₂, colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque brick-red to brown, vitreous to dull luster, conchoidal fracture, no visible cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.6. The angular contrasting patches suggest brecciation and later silica cementation.
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Physical properties
Opaque brick-red to brown, vitreous to dull luster, conchoidal fracture, no visible cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.6. The angular contrasting patches suggest brecciation and later silica cementation.
Formation & geological history
Forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal rock, with iron oxides producing the red color; specimens may range from Precambrian to younger rocks depending on locality. Exact age and provenance cannot be determined from the image.
Uses & applications
Used for carvings, cabochons, beads, ornaments, lapidary work, and occasionally decorative stone; too fractured or iron-rich for many industrial applications.
Geological facts
Jasper is a variety of opaque chalcedony or microcrystalline quartz rather than a single mineral species. Its red coloration commonly reflects hematite or goethite inclusions.
Field identification & locations
Identify it by its opaque red color, very hard surface, lack of cleavage, and conchoidal chips; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, Australia, and the western United States.
