mineral

Polished brown jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂; chalcedony)

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque reddish-brown with a waxy to vitreous polish, and a microcrystalline structure; no visible cleavage. The smooth, rounded shape indicates it has been tumbled or polished.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms as silica-rich fluids fill or replace rock, often coloring it with iron oxides. It occurs in many geological settings and ages; the image alone cannot establish its source or exact variety.

Uses & applications

Used for beads, cabochons, ornaments, and lapidary collections; it is not generally used as a major construction material.

Geological facts

Jasper’s colors and patterns vary widely with mineral impurities, especially iron oxides.

Field identification & locations

Look for opacity, hardness, and a fine-grained texture; it should resist scratching by a steel knife and can scratch glass. Similar brown stones can be distinguished reliably only with closer examination or testing.