mineral
Polished pink-orange agate/jasper fragment
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions; exact identification is uncertain from the image
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; translucent salmon-orange body with white banding, waxy to vitreous luster, cryptocrystalline structure, and no obvious cleavage. The dark brown-black area may be iron/manganese oxides or attached matrix.
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Physical properties
Hardness about 6.5–7 Mohs; translucent salmon-orange body with white banding, waxy to vitreous luster, cryptocrystalline structure, and no obvious cleavage. The dark brown-black area may be iron/manganese oxides or attached matrix.
Formation & geological history
Forms when silica-rich groundwater fills cavities in volcanic rock, depositing layered chalcedony over long periods, commonly during the Cenozoic or older volcanic episodes. Typical sources include Brazil, Uruguay, Mexico, Madagascar, and the western United States.
Uses & applications
Used for cabochons, carvings, beads, lapidary pieces, and ornamental objects; similar material is also sold as carnelian or orange jasper.
Geological facts
The translucent orange portion resembles carnelian, while visible pale banding suggests agate; the specimen may be a mixed agate–jasper piece rather than a single named variety.
Field identification & locations
Look for curved or parallel chalcedony bands, waxy luster, and hardness sufficient to scratch glass; a streak test should be white. Acid produces no reaction, distinguishing it from calcite; locality and polishing may be needed for a firm name.
