mineral
Polished brecciated jasper
Silica-rich chalcedony/quartz (SiO₂), with iron-oxide coloring
AI-generated identification · may be incorrectOpaque, polished pebble with brown, cream, and pale-blue-gray angular patches and veins. Quartz hardness is about 6.5–7 Mohs; crystalline silica has a trigonal structure, while chalcedony is microcrystalline; specific gravity is about 2.6.
Identified More mineral →
Explore Polished brecciated jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Opaque, polished pebble with brown, cream, and pale-blue-gray angular patches and veins. Quartz hardness is about 6.5–7 Mohs; crystalline silica has a trigonal structure, while chalcedony is microcrystalline; specific gravity is about 2.6.
Formation & geological history
Likely silica-rich material fractured and cemented or veined by later silica, then colored by iron oxides; the image does not establish its exact geological age or locality.
Uses & applications
Decorative and collectible stone; commonly used for cabochons, beads, and carvings.
Geological facts
The contrasting angular fragments give it a brecciated appearance; similar patterns occur in several jasper varieties, so a precise trade name cannot be confirmed from the photo alone.
Field identification & locations
Look for opaque, hard silica with distinct fragment-like color patches and a vitreous-to-waxy polish. Jasper and related chalcedony occur worldwide, including Brazil, India, Madagascar, and the western United States.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary