mineral
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectTypically brick-red to reddish-brown, opaque, with a waxy to vitreous luster after polishing; Mohs hardness 6.5–7, no visible cleavage, cryptocrystalline quartz structure, and specific gravity about 2.5–2.7.
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Physical properties
Typically brick-red to reddish-brown, opaque, with a waxy to vitreous luster after polishing; Mohs hardness 6.5–7, no visible cleavage, cryptocrystalline quartz structure, and specific gravity about 2.5–2.7.
Formation & geological history
Forms when silica-rich groundwater replaces or fills cavities in volcanic or sedimentary rocks, incorporating iron minerals; deposits range from Precambrian to recent geological ages.
Uses & applications
Used for beads, cabochons, carvings, ornaments, and tumbled-stone collections; durable pieces may serve as decorative inlay or small lapidary objects.
Geological facts
The red color results from hematite or other iron-oxide inclusions. “Red jasper” is a trade name covering several visually similar iron-rich chert and jasper varieties.
Field identification & locations
Identify it by its uniform opaque red color, glassy/waxy polish, lack of cleavage, and resistance to scratching by ordinary steel; common sources include India, Brazil, Madagascar, Uruguay, and the United States.
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