mineral
Tumbled honey-brown chalcedony (likely common quartz)
Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony or low-grade agate
AI-generated identification · may be incorrectTranslucent gray-brown to honey-brown, waxy-to-glassy luster, rounded by tumbling, and lacking visible cleavage; Mohs hardness about 6.5–7, with specific gravity near 2.6. Internal cloudy zones and fine fractures are consistent with chalcedony or quartz-rich material.
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Physical properties
Translucent gray-brown to honey-brown, waxy-to-glassy luster, rounded by tumbling, and lacking visible cleavage; Mohs hardness about 6.5–7, with specific gravity near 2.6. Internal cloudy zones and fine fractures are consistent with chalcedony or quartz-rich material.
Formation & geological history
Silica-rich groundwater deposited microscopic quartz fibers in cavities or fractures, with iron oxides producing the brown color; the specimen was subsequently cut or naturally broken and mechanically tumbled. The exact geological age cannot be determined visually and depends on its source deposit.
Uses & applications
Used as an inexpensive lapidary stone for cabochons, carvings, beads, and polished specimens; generally has modest jewelry and collecting value.
Geological facts
Chalcedony is quartz with crystals too small to see individually; translucent varieties may be marketed as honey chalcedony, brown agate, or jasper depending on opacity and banding.
Field identification & locations
Test cautiously for glassy quartz hardness: it should scratch ordinary glass but not be scratched by a steel knife; a streak test is usually white. Common sources include Brazil, Uruguay, India, Madagascar, Mexico, and the western United States.
