mineral

Polished brecciated jasper

Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque, with a waxy to glassy luster and irregular fracture; this specimen shows red-brown, gray, white, and dark angular-to-flowing patterns. It is likely polished or naturally smoothed, so crystal grains are microscopic rather than visibly crystalline.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or cements volcanic or sedimentary material, commonly incorporating iron oxides that create red coloration; brecciation and later silicification may occur over long geological intervals. Exact age and locality cannot be determined from the image.

Uses & applications

Used as an ornamental stone for cabochons, carvings, bookends, polished slabs, and small collectibles; rarely used as aggregate or architectural facing.

Geological facts

Jasper is an opaque variety of chalcedony, unlike translucent agate. Patterned varieties are often sold under trade names such as brecciated, ocean, or Picasso jasper, which may not indicate a formal species.

Field identification & locations

Identify it by its opacity, high silica hardness, dense weight, conchoidal-to-irregular fracture, and red iron-stained patterning; it commonly occurs in volcanic terrains and silica-rich sedimentary deposits worldwide. A streak test should be white, and it should not scratch easily with a steel knife.