sedimentary

Orange chert or jasper fragment

Microcrystalline quartz (SiO₂), commonly iron-oxide-stained; probable jasper/chert

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; orange-red, opaque, and typically waxy to dull luster with no visible cleavage. Dense, fine-grained cryptocrystalline quartz may show conchoidal fracture; the pictured piece appears rough or possibly cut/polished.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich fluids or sediments lithify and recrystallize, with iron oxides producing the orange-red color. Chert and jasper range from Precambrian to recent in age and occur in sedimentary beds, volcanic settings, and hydrothermal veins.

Uses & applications

Used for ornamental stone, cabochons, beads, carvings, lapidary work, and historically for sharp tools; larger jasper pieces may be used decoratively.

Geological facts

Jasper is an opaque, impure variety of chert colored by hematite or goethite. Orange material is sometimes marketed as orange jasper, although trade names can be inconsistent.

Field identification & locations

Identify by its opaque orange-red color, very fine texture, high hardness, and inability to scratch with a steel knife easily; quartz-rich surfaces may scratch glass. Common worldwide, including India, Madagascar, Brazil, Australia, and the western United States.