mineral
Jasper (likely brecciated iron-stained jasper)
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque cream, red, orange, and brown patches with a dull to waxy luster. It has a fine-grained quartz structure and no visible cleavage; the angular cream section may be quartz or chalcedony.
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Physical properties
Hardness about 6.5–7 Mohs; opaque cream, red, orange, and brown patches with a dull to waxy luster. It has a fine-grained quartz structure and no visible cleavage; the angular cream section may be quartz or chalcedony.
Formation & geological history
Silica-rich material was deposited and later silicified; iron oxides produced the warm colors, and fracturing followed by mineral infill can create brecciation. Such jasper forms in many settings and may range widely in geological age.
Uses & applications
Used for cabochons, beads, carvings, and decorative stone; also collected as a rough specimen.
Geological facts
Jasper’s distinctive colors and patterns arise largely from impurities, especially iron oxides.
Field identification & locations
The opaque, fine-grained surface and hardness are consistent with jasper, but the photo alone cannot confirm the exact variety. Jasper occurs worldwide, including in volcanic and sedimentary silica-rich deposits.
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