mineral

Yellow-brown jasper (likely iron-stained chert)

Microcrystalline quartz (SiO₂), varieties of chalcedony/chert colored by iron oxides

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, opaque yellow, ochre, or brown, with a dull to waxy luster and conchoidal fracture; no visible cleavage. The specimen appears dense and fine-grained, though the image alone cannot confirm the exact variety.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement sediment, with iron oxides producing the coloration; commonly associated with volcanic or sedimentary environments. Formation ages vary widely, from Precambrian to recent.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and lapidary rough; historically used for tools and flaking implements. It has little industrial value compared with ordinary quartz.

Geological facts

Jasper is an opaque variety of chalcedony/chert rather than a separate mineral species. Yellow coloration commonly reflects goethite or limonite inclusions.

Field identification & locations

Identify it by testing for glass-scratching hardness, opaque fine texture, and conchoidal fracture; it should not fizz in dilute hydrochloric acid. Common worldwide, especially in volcanic terrains and silica-rich sedimentary formations.