mineral
Tumbled or naturally weathered quartz-rich stone, possibly iron-stained quartz
Quartz (SiO₂), with yellow-brown iron-oxide staining; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectHardness 7, vitreous to waxy luster, translucent amber-brown coloration, and no obvious cleavage; the rough gray-brown surface may be matrix or weathering rind. Crystal structure is trigonal, though individual crystal form is not visible.
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Physical properties
Hardness 7, vitreous to waxy luster, translucent amber-brown coloration, and no obvious cleavage; the rough gray-brown surface may be matrix or weathering rind. Crystal structure is trigonal, though individual crystal form is not visible.
Formation & geological history
Likely formed in a hydrothermal vein or weathered quartz-bearing rock; iron minerals oxidized to produce the yellow-brown coating. Its geological age cannot be determined visually and depends on its source deposit.
Uses & applications
Quartz is used in glass, ceramics, abrasives, electronics, and collecting; attractive translucent pieces may be sold as specimens or informal gemstones. This small irregular piece has limited commercial value.
Geological facts
A steel file should generally scratch glass only if the specimen is quartz-rich, while a steel knife should not scratch it. Yellow coloration may result from limonite/goethite rather than naturally yellow quartz (citrine).
Field identification & locations
Common in quartz veins, stream gravels, and weathered igneous or metamorphic terrains worldwide; test with hardness, streak, and close inspection for quartz crystal faces. Estimated value: $1–$10 for a common piece, occasionally $10–$30 if unusually transparent or well formed.
