mineral
Red jasper (likely polished/tumbled)
Jasper, an opaque microcrystalline variety of quartz; mainly SiO₂ with iron-oxide inclusions
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7, opaque red to orange-red, with a glassy to dull/waxy luster and no visible cleavage; cryptocrystalline quartz structure, specific gravity about 2.5–2.9.
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Physical properties
Typically Mohs hardness 6.5–7, opaque red to orange-red, with a glassy to dull/waxy luster and no visible cleavage; cryptocrystalline quartz structure, specific gravity about 2.5–2.9.
Formation & geological history
Forms when silica-rich fluids cement or replace volcanic ash, sediment, or other rock, with iron oxides producing the red color; specimens range from Precambrian to recent geological settings.
Uses & applications
Used for beads, cabochons, carvings, tumbled stones, ornamental objects, and minor decorative aggregate; common polished pieces usually have modest value.
Geological facts
The red coloration is caused mainly by hematite or other iron oxides. Jasper is technically a rock rather than a single mineral, despite its quartz-dominated composition.
Field identification & locations
Identify it by its opaque red color, smooth polish, fine texture, and inability to scratch easily with a steel blade; common sources include India, Madagascar, Brazil, Uruguay, and the western United States.
