sedimentary

Reddish chert or jasper fragment

Microcrystalline quartz (SiO₂), iron-oxide-bearing; possibly hematitic jasper

AI-generated identification · may be incorrect

Typically hardness 6.5–7, opaque red to brown with white quartz-like veining, dull to waxy luster, and no visible cleavage; conchoidal fracture is common. The specimen appears rough and naturally fractured, though the image cannot confirm texture conclusively.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement sediment, with iron oxides producing the red coloration; deposits range from Precambrian to recent. It commonly occurs as nodules, beds, or fracture fillings in sedimentary terrains.

Uses & applications

Used as an ornamental stone, lapidary material, cabochons, beads, and occasionally aggregate. Attractive polished pieces have modest collector value.

Geological facts

Jasper is an opaque variety of chalcedony or chert colored by impurities, especially hematite and goethite. White areas may be quartz-rich zones or weathered surfaces.

Field identification & locations

Common in sedimentary outcrops, river gravels, and chert-bearing formations worldwide; test hardness against steel or glass and inspect for a waxy surface and conchoidal edges. Exact identification would benefit from a fresh cut surface or hardness test.