mineral
Banded jasper pebble
Microcrystalline quartz (SiO₂), iron-oxide colored; likely jasper/chert
AI-generated identification · may be incorrectOpaque, mottled cream and reddish-brown, with a waxy to dull luster and no visible cleavage. Quartz hardness is about 7 Mohs; the small, rounded piece appears naturally water-worn or polished.
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Physical properties
Opaque, mottled cream and reddish-brown, with a waxy to dull luster and no visible cleavage. Quartz hardness is about 7 Mohs; the small, rounded piece appears naturally water-worn or polished.
Formation & geological history
Jasper forms when silica-rich fluids fill sedimentary or volcanic cavities and deposits microcrystalline quartz, often with iron oxides that create red-brown colors. Its precise geological age and source cannot be determined from the image.
Uses & applications
Used as an ornamental stone, in beads and small carvings, and as a common collecting material.
Geological facts
Jasper is an opaque variety of chalcedony; its patterns and colors arise from impurities and mineral inclusions.
Field identification & locations
The opaque appearance, quartz-like hardness, and earthy iron-oxide coloration fit jasper, but a photo cannot confirm the identification. Jasper occurs worldwide in sedimentary and volcanic settings.
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