igneous
Polished jasper pebble (possibly orbicular jasper)
Microcrystalline quartz (SiO₂), likely jasper; exact variety cannot be confirmed visually
AI-generated identification · may be incorrectOpaque, rounded yellow-tan and blue-gray pattern with a smooth polish and waxy-to-glassy luster. Quartz hardness is about 7 Mohs; crystals are microscopic, with no visible cleavage and conchoidal fracture.
Identified More igneous →
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Physical properties
Opaque, rounded yellow-tan and blue-gray pattern with a smooth polish and waxy-to-glassy luster. Quartz hardness is about 7 Mohs; crystals are microscopic, with no visible cleavage and conchoidal fracture.
Formation & geological history
Jasper forms when silica-rich fluids fill or replace rock, often coloring microcrystalline quartz with iron oxides and other minerals. Its age and precise formation environment cannot be determined from the image.
Uses & applications
Used for cabochons, beads, ornaments, and lapidary collections; this small pebble is mainly decorative.
Geological facts
Jasper is a trade name for opaque, patterned varieties of chalcedony, not one uniquely defined mineral species.
Field identification & locations
Look for opacity, hardness, and a smooth, waxy surface; jasper commonly occurs in silica-rich volcanic or sedimentary settings worldwide. The visible color zones alone cannot establish a specific variety.
