mineral
Red jasper (likely tumbled)
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored red by iron oxides
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; reddish-brown with white patches, opaque, and typically dull to waxy; trigonal quartz structure with no visible cleavage. The rounded shape and smooth surface suggest tumbling.
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Physical properties
Hardness about 6.5–7 Mohs; reddish-brown with white patches, opaque, and typically dull to waxy; trigonal quartz structure with no visible cleavage. The rounded shape and smooth surface suggest tumbling.
Formation & geological history
Forms when silica-rich fluids or sediments become iron-stained and silicified. Jasper occurs in many geological ages and settings, including volcanic rocks and sedimentary deposits.
Uses & applications
Used for beads, cabochons, carvings, and ornamental objects; also collected as a decorative stone.
Geological facts
Jasper’s colors and patterns vary widely, and the name covers opaque, impurity-rich chalcedony rather than a single distinct mineral species.
Field identification & locations
Look for a dense, opaque stone with a smooth or conchoidally fractured surface and red coloration; white patches may be quartz or chalcedony. Found worldwide, including India, Brazil, Australia, and the western United States.
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