mineral
Tumbled yellow-brown jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides
AI-generated identification · may be incorrectSmooth, opaque ochre-brown surface with a glassy polish; quartz hardness about 6.5–7 Mohs, trigonal crystal structure at microscopic scale, and no visible cleavage. The photo cannot establish the exact variety or composition.
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Physical properties
Smooth, opaque ochre-brown surface with a glassy polish; quartz hardness about 6.5–7 Mohs, trigonal crystal structure at microscopic scale, and no visible cleavage. The photo cannot establish the exact variety or composition.
Formation & geological history
Jasper forms when silica-rich fluids or sediments become silicified, with iron compounds producing earthy colors. It occurs in deposits of many geological ages.
Uses & applications
Commonly tumbled for jewelry, cabochons, beads, and decorative objects; jasper is also collected as an ornamental stone.
Geological facts
Jasper is defined by its opacity and fine-grained quartz texture; its patterns and colors vary widely with mineral impurities.
Field identification & locations
Look for a dense, opaque stone with a smooth, waxy-to-glassy polish and no obvious individual crystals. Similar-looking materials can be difficult to distinguish from a photograph; jasper is found worldwide.
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igneous
Epidote
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Gypsum (variety Selenite or Alabaster)
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Mineral