sedimentary

Jasper and Quartz Breccia

Silica breccia (SiO2)

Hardness of 7 on the Mohs scale; colors range from white and cream to reddish-brown and dark brown due to iron oxide staining; dull to vitreous luster; massive and microcrystalline crystal structure; conchoidal fracture with no true cleavage; specific gravity around 2.60-2.65.

Identified August 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through tectonic fracturing or faulting of pre-existing rock followed by the cementation of angular fragments by hydrothermal silica-rich fluids, often occurring in hydrothermal veins or fault zones.

Uses & applications

Used primarily as decorative lapidary material, carved into ornamental objects, tumbled stones, or collected by rockhounds.

Geological facts

Breccias are fragmental rocks composed of broken tectonic or sedimentary pieces cemented together. The reddish patches indicate iron-rich jasper mixed with white quartz veins.

Field identification & locations

Can be identified in the field by its distinct angular broken fragments cemented in a contrasting matrix, high hardness that scratches glass, and lack of fizz with hydrochloric acid. Found worldwide in fault zones and mineralized veins.

Other sedimentary specimens

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Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Quartz pebble

Silicon dioxide (SiO2)

sedimentary

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

sedimentary

Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

sedimentary

Sedimentary Sandstone

Arenite (Sedimentary Rock)

sedimentary