mineral

Tumbled jasper/quartz-rich pebble

Microcrystalline quartz (SiO₂), likely jasper with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque, rounded, brown-orange and gray with rusty iron staining; dull to slightly waxy luster and no visible cleavage. Quartz hardness is about 7 Mohs; specific gravity is roughly 2.6, though the exact composition is uncertain from the image.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally weathered and water-rounded siliceous pebble, later tumbled or polished; iron minerals produced the orange-brown colors. Jasper commonly forms by silica-rich groundwater replacing or cementing volcanic or sedimentary material, with ages varying widely.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and decorative objects; this small piece has modest jewelry and collecting value.

Geological facts

The gray-white patches may be chalcedony or quartz, while dark areas may contain iron or manganese oxides. It is not possible to confirm a specific jasper variety visually alone.

Field identification & locations

Look for opacity, fine-grained texture, conchoidal fracture, and hardness sufficient to scratch glass; a streak, hardness, and specific-gravity test would help distinguish jasper from ordinary iron-stained quartzite or chert. Common worldwide, especially in volcanic and silica-rich gravel deposits.