mineral
Tumbled jasper/quartz-rich pebble
Microcrystalline quartz (SiO₂), likely jasper with iron-oxide inclusions
AI-generated identification · may be incorrectOpaque, 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.
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Physical properties
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.
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.
