mineral

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), brecciated variety

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque to slightly translucent, with reddish-brown, cream, gray, and black angular patches. Waxy to vitreous luster, cryptocrystalline quartz structure, and no visible cleavage; specific gravity about 2.6–2.7.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace fractured volcanic or sedimentary rock, commonly with iron-oxide coloration. Most specimens are Paleozoic to younger, depending on the deposit, and are later polished or tumbled.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary display; occasionally used as decorative stone. Its value is primarily aesthetic rather than industrial.

Geological facts

The angular contrasting fragments indicate brecciation, while reddish hues generally reflect hematite or other iron oxides. Jasper is a variety of chalcedony/microcrystalline quartz rather than a single chemically uniform mineral.

Field identification & locations

Identify it by its opaque patterned body, glass-scratching hardness, lack of cleavage, and fine-grained texture; common sources include India, Madagascar, Brazil, Australia, and the western United States.