metamorphic
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque mustard-yellow, brown, cream, and reddish zones with a polished waxy-to-glassy luster. Massive, cryptocrystalline quartz; no visible cleavage, and relatively high durability (specific gravity ~2.5–2.7).
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Physical properties
Hardness about 6.5–7 Mohs; opaque mustard-yellow, brown, cream, and reddish zones with a polished waxy-to-glassy luster. Massive, cryptocrystalline quartz; no visible cleavage, and relatively high durability (specific gravity ~2.5–2.7).
Formation & geological history
Forms when silica-rich fluids cement or replace sediment and volcanic material, with iron oxides producing the yellow, brown, and red colors; most examples are Precambrian to younger, depending on locality.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and ornamental objects; attractive patterns may have modest jewelry and collecting value.
Geological facts
The specimen appears tumbled or smoothly polished and may be brecciated or color-banded jasper rather than a single uniform variety.
Field identification & locations
Identify by its opaque appearance, hardness, fine texture, and resistance to scratching by steel; common sources include India, Madagascar, Brazil, Australia, and the western United States. A definitive variety requires locality or testing.
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