mineral

Red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque brick-red to reddish-brown, with a dull to waxy luster and cryptocrystalline quartz structure; no visible cleavage, conchoidal to uneven fracture, and density about 2.5–2.7.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace fine sediments and volcanic material, with iron staining producing the red color; specimens commonly formed in Precambrian to younger hydrothermal and sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, countertops, and ornamental objects; modest jewelry and lapidary material.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz, though its dense opaque texture distinguishes it from translucent agate. The pictured piece appears naturally fractured and rounded, possibly lightly tumbled or water-worn.

Field identification & locations

Identify by its uniform red color, opacity, fine grain, hardness, and lack of cleavage; common sources include India, Madagascar, Brazil, the United States, and Australia. A streak, hardness, and acid test can help distinguish it from red ceramic or dyed stone.