mineral
Tumbled quartz-rich stone, likely orange chalcedony or iron-stained quartzite
Microcrystalline quartz (SiO₂), possibly quartzite; orange coloration from iron oxides
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7, opaque to slightly translucent, orange-tan color, vitreous to waxy luster, and no visible cleavage; compact and smoothly water-worn or tumbled.
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Physical properties
Typically Mohs hardness 6.5–7, opaque to slightly translucent, orange-tan color, vitreous to waxy luster, and no visible cleavage; compact and smoothly water-worn or tumbled.
Formation & geological history
Quartz-rich material formed through silica precipitation or metamorphism of sandstone, with later iron-oxide staining. Its exact geological age and locality cannot be determined from the photograph.
Uses & applications
Used as a lapidary material for cabochons, beads, carvings, and decorative stones; low-grade pieces are common landscaping or craft material.
Geological facts
The orange color commonly reflects hematite or limonite inclusions rather than the quartz itself. A steel file or knife should not readily scratch genuine quartz-rich material.
Field identification & locations
Look for hardness, a glassy/waxy surface, conchoidal fracture, and resistance to scratching; an unglazed ceramic streak test may help, though surface coatings can interfere. Common worldwide in quartz veins, river gravels, and altered sandstones.
