metamorphic
Tumbled yellow-orange stone, likely yellow jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the image
AI-generated identification · may be incorrectOpaque, smooth, rounded, mottled yellow, orange, and cream; quartz-rich stones have Mohs hardness about 6.5–7 and a waxy to dull luster. Jasper has a microcrystalline quartz structure and no visible cleavage; specific gravity is about 2.6.
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Physical properties
Opaque, smooth, rounded, mottled yellow, orange, and cream; quartz-rich stones have Mohs hardness about 6.5–7 and a waxy to dull luster. Jasper has a microcrystalline quartz structure and no visible cleavage; specific gravity is about 2.6.
Formation & geological history
Jasper forms when silica-rich fluids cement or replace sediments and volcanic material, with iron oxides producing yellow-orange color. Its formation age depends on the source deposit; tumbling only shapes and polishes the stone.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; common material has modest collectible value.
Geological facts
Jasper is a trade name covering many opaque, patterned varieties of chalcedony, and color alone cannot determine the exact type.
Field identification & locations
Look for opacity, quartz-like hardness, and a fine-grained surface; it should scratch glass and resist a steel knife. Jasper occurs in many regions worldwide, but this specimen’s locality cannot be inferred from the photo.
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