mineral

Iron-rich jasper (red jasper/ironstone)

Microcrystalline quartz (SiO₂) colored by hematite and goethite

AI-generated identification · may be incorrect

Opaque, brick-red to brown with yellow-brown earthy patches and dull to waxy luster; likely hardness 6.5–7 Mohs, no obvious cleavage, and fine cryptocrystalline texture. Specific gravity is commonly about 2.6–2.8.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sediments, often incorporating iron oxides; deposits range from Precambrian banded-iron settings to younger hydrothermal and weathering environments. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, tumbling material, and minor aggregate. Attractive patterned pieces are collected, while ordinary rough is inexpensive.

Geological facts

The red color is chiefly hematite; yellow-brown areas may contain goethite or limonite. It is related to chert but is distinguished by abundant iron-oxide coloration and opacity.

Field identification & locations

Identify by its opaque red-brown color, very fine texture, glass-scratching hardness, and lack of visible grains or cleavage; an iron streak may appear on an unglazed ceramic tile. Common sources include Australia, India, Brazil, South Africa, and the United States.