mineral

Red jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque brick-red to brown, with pale gray-white vein lines and a waxy to dull luster; typically massive and non-cleaving. Mohs hardness 6.5–7; specific gravity about 2.5–2.7.

Identified September 13, 2026More mineral →

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Physical properties

Opaque brick-red to brown, with pale gray-white vein lines and a waxy to dull luster; typically massive and non-cleaving. Mohs hardness 6.5–7; specific gravity about 2.5–2.7.

Formation & geological history

Forms when silica-rich fluids cement or replace rock, with iron oxides producing the red color; brecciated varieties contain angular fragments healed by silica. Commonly Precambrian to younger, depending on the deposit.

Uses & applications

Used for tumbled stones, cabochons, carvings, beads, lapidary ornaments, and minor decorative stone; generally not used as a major construction stone.

Geological facts

Jasper is a variety of opaque chalcedony and can show intricate natural veining or brecciation. Its red color is commonly due to hematite or other iron minerals.

Field identification & locations

Identify it by its opaque red body, hardness, lack of visible crystal grains, and resistance to scratching by steel; it should not fizz in dilute acid. Common sources include India, Madagascar, Brazil, Australia, and the western United States.