metamorphic
Polished golden-brown stone, likely iron-rich quartzite or jasper
Quartzite (mostly SiO₂) or ferruginous jasper (microcrystalline SiO₂ with iron oxides)
AI-generated identification · may be incorrectAppears tan-gold with brown iron-oxide patches and a matte-to-waxy surface; likely hardness about 6.5–7 Mohs, with no obvious cleavage and granular or cryptocrystalline texture. The image is insufficient to distinguish quartzite from jasper confidently.
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Physical properties
Appears tan-gold with brown iron-oxide patches and a matte-to-waxy surface; likely hardness about 6.5–7 Mohs, with no obvious cleavage and granular or cryptocrystalline texture. The image is insufficient to distinguish quartzite from jasper confidently.
Formation & geological history
Quartzite forms when quartz-rich sandstone is metamorphosed under heat and pressure; jasper forms from silica-rich sediment or volcanic fluids later colored by iron oxides. Precise age and locality cannot be determined visually.
Uses & applications
Used as decorative stone, lapidary material, cabochons, tumbled stones, and occasionally aggregate or facing stone. Value is generally modest unless the pattern, polish, or locality is exceptional.
Geological facts
Iron staining commonly produces yellow, orange, red, and brown coloration in silica-rich rocks. A glassy scratch test and examination of grain boundaries can help separate quartzite from jasper.
Field identification & locations
Common in metamorphic belts, gravel deposits, and streambeds worldwide. Test whether it scratches ordinary glass and inspect a fresh surface: visible interlocking quartz grains suggest quartzite, while a uniformly smooth microcrystalline texture suggests jasper.
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