gemstone

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque, with a glassy to waxy luster and cryptocrystalline quartz structure; this tumbled specimen shows reddish-brown, gray-green, and cream breccia-like veining.

Identified August 10, 2026More gemstone →

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Physical properties

Typically Mohs hardness 6.5–7, opaque, with a glassy to waxy luster and cryptocrystalline quartz structure; this tumbled specimen shows reddish-brown, gray-green, and cream breccia-like veining.

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediment and volcanic material, commonly incorporating iron oxides and fractured rock fragments. Most deposits are Phanerozoic, though exact age depends on locality.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and polished stones; durable but generally unsuitable for fine faceted jewelry because it is opaque and patterned.

Geological facts

“Brecciated” describes angular fragments or vein-like patches cemented by silica. Color variation commonly comes from hematite, goethite, chlorite, or other inclusions.

Field identification & locations

Identify it by its opaque appearance, randomized earthy pattern, lack of cleavage, and resistance to scratching by ordinary steel; common sources include Australia, Brazil, India, Madagascar, and the western United States.