metamorphic

Polished orange-red jasper (probable)

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

AI-generated identification · may be incorrect

Opaque orange to reddish-brown, smoothly polished, with a fine-grained texture and weak vitreous-to-waxy luster; Mohs hardness about 6.5–7, no visible cleavage, and specific gravity about 2.5–2.7. The specimen may also contain hematite, goethite, or minor silica-rich material.

Identified August 31, 2026More metamorphic →

Explore Polished orange-red jasper (probable) 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

Jasper forms when silica-rich fluids cement or replace sediments and volcanic rock, with iron producing the orange-red color; ages vary widely, commonly Precambrian to younger. The rounded shape indicates tumbling or deliberate polishing rather than natural crystal form.

Uses & applications

Used for cabochons, carvings, ornamental objects, countertops, and inexpensive lapidary specimens. Its value is mainly decorative and depends on color, pattern, polish, and size.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz; unlike translucent agate, it is generally nontransparent because of abundant inclusions. Exact identification would benefit from a streak, hardness, or specific-gravity test.

Field identification & locations

Commonly found worldwide, including India, Madagascar, Brazil, Australia, Mexico, and the western United States. Field clues include a dense feel, orange-red iron staining, lack of cleavage, and inability to scratch it with a steel knife; glass should be difficult to scratch.