mineral

Tumbled jasper (likely yellow/brown jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides and other impurities

AI-generated identification · may be incorrect

Opaque, mustard-brown with dark inclusions and a smooth polished surface. Quartz hardness is 6.5–7 Mohs; vitreous to dull luster, cryptocrystalline structure, and no cleavage. The exact variety cannot be confirmed from the image alone.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids deposit and solidify, often replacing or filling cavities in volcanic rocks or sediments; iron compounds create its colors. Its age depends on the source deposit.

Uses & applications

Used for beads, cabochons, ornaments, and small carvings; also collected as a decorative stone.

Geological facts

Jasper is an opaque variety of chalcedony, unlike translucent agate; its patterns and colors reflect trace minerals and inclusions.

Field identification & locations

Look for opacity, fine-grained texture, and hardness sufficient to scratch glass; common deposits occur worldwide. This appears to be a polished/tumbled pebble, so locality and precise identification are uncertain.