metamorphic
Polished jasper pebble
Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions
AI-generated identification · may be incorrectOpaque, orange-red, yellow, cream, and gray mottling; earthy to waxy luster; hardness about 6.5–7 Mohs; no visible cleavage; cryptocrystalline quartz structure; specific gravity approximately 2.5–2.7.
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Physical properties
Opaque, orange-red, yellow, cream, and gray mottling; earthy to waxy luster; hardness about 6.5–7 Mohs; no visible cleavage; cryptocrystalline quartz structure; specific gravity approximately 2.5–2.7.
Formation & geological history
Likely formed when silica-rich fluids replaced or cemented volcanic or sedimentary material, with iron oxides producing the red-orange colors. Jasper deposits range from Precambrian to younger geological ages.
Uses & applications
Used as a decorative stone, cabochon, tumbled stone, carving material, and inexpensive jewelry or ornament; not generally used structurally.
Geological facts
The specimen’s rounded shape and smooth surface indicate deliberate tumbling or natural stream abrasion. Its coloring resembles brecciated, ocean, or picture jasper, but exact variety requires locality or testing.
Field identification & locations
Identify jasper by its opacity, fine texture, lack of cleavage, and ability to scratch glass; it differs from agate, which is typically translucent and banded. Common sources include India, Madagascar, Brazil, Mexico, Australia, and the western United States.
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