mineral
Polished brecciated jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide staining
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; cream, red, and orange mottling; opaque, with a waxy to vitreous luster when polished. Quartz has a trigonal crystal structure, but its grains are too fine to see; no distinct cleavage.
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Physical properties
Hardness about 6.5–7 Mohs; cream, red, and orange mottling; opaque, with a waxy to vitreous luster when polished. Quartz has a trigonal crystal structure, but its grains are too fine to see; no distinct cleavage.
Formation & geological history
Silica-rich sediment or volcanic material was cemented and colored by iron oxides; the angular-looking patches suggest brecciation before silicification. Jasper deposits formed in many geological periods and settings.
Uses & applications
Used for cabochons, beads, carvings, and decorative objects; also collected as a polished specimen.
Geological facts
Jasper’s colors and patterns come from impurities and inclusions, especially iron oxides; the name covers many visually varied varieties.
Field identification & locations
Look for opaque, finely textured material with irregular red or orange patterns and no obvious individual crystals; hardness and appearance help distinguish it from softer lookalikes. Found worldwide in sedimentary and volcanic terrains.
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