mineral

Orange chert or jasper fragment

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing jasper

AI-generated identification · may be incorrect

Typically hardness 6.5–7, opaque orange-red to brown, with a dull-to-waxy luster and conchoidal fracture; the image suggests a dense, fine-grained silica specimen with iron staining. Crystal grains are microscopic, so cleavage is absent or indistinct; specific gravity is about 2.6.

Identified September 1, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement sediment, commonly in marine chemical sediments, volcanic settings, or hydrothermal environments; iron oxides create the orange coloration. Ages range from Precambrian to Recent depending on the deposit.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and lapidary rough; lower-grade pieces are mainly curios or teaching specimens.

Geological facts

Jasper is technically an opaque variety of chert, and its colors commonly reflect hematite or goethite impurities.

Field identification & locations

Identify it by its very fine texture, opacity, hardness, and glassy/conchoidal fracture; it should scratch glass but not be scratched by a steel knife. Common sources include the western United States, Australia, Brazil, India, and Madagascar.