metamorphic
Red jasper-bearing rock
Jasper (microcrystalline quartz, SiO₂), likely hematite-rich metachert or ironstone
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque brick-red to gray, with earthy to weakly vitreous luster and irregular fracture. The red color is produced by finely dispersed hematite or iron oxides; no obvious cleavage or visible crystal structure.
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Physical properties
Hardness about 6.5–7 Mohs; opaque brick-red to gray, with earthy to weakly vitreous luster and irregular fracture. The red color is produced by finely dispersed hematite or iron oxides; no obvious cleavage or visible crystal structure.
Formation & geological history
Likely formed when silica-rich sediment or chert was impregnated with iron oxides, then mildly metamorphosed; exact age cannot be determined from the photograph. Jasper and hematite-rich ironstones occur in many Precambrian and younger sedimentary terrains.
Uses & applications
Used as ornamental stone, cabochons, carvings, beads, and polished specimens; exceptionally durable material can serve as decorative aggregate. Rough common pieces generally have modest commercial value.
Geological facts
The specimen appears to contain red jasper intergrown with gray quartz/chert and iron-oxide zones. A ceramic-streak test may leave little to no streak for jasper, while associated hematite commonly gives a reddish-brown streak.
Field identification & locations
Identify it by its opaque red coloration, very fine grain, high hardness, and lack of cleavage; it should resist scratching by a steel knife. Common sources include India, Brazil, Australia, South Africa, and the western United States.
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