gemstone

Polished brecciated jasper

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

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, opaque, with red-brown iron-rich patches, gray-blue areas, and a waxy to vitreous luster; it has no visible cleavage and a cryptocrystalline quartz structure. The rounded, glossy surface indicates tumbling or polishing.

Identified August 9, 2026More gemstone →

Explore Polished brecciated jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace fine sediment or rock fragments, with iron oxides producing red coloration; formation ages vary from Precambrian to younger volcanic or sedimentary settings. Common sources include India, Madagascar, Indonesia, Brazil, and the western United States.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and small polished specimens; it has little industrial value compared with ordinary quartz.

Geological facts

Brecciated jasper is composed of angular fragments cemented by silica and often resembles brecciated rhyolite or bloodstone. Color patterns are natural and vary substantially between pieces.

Field identification & locations

Identify it by its opaque red-brown matrix, irregular contrasting patches, lack of cleavage, and ability to scratch ordinary glass. A streak test is usually white to faintly colored; common localities include Oregon, California, Arizona, India, and Madagascar.