metamorphic
Polished pink quartzite or quartz-rich jasper
Quartzite; predominantly quartz (SiO₂), with iron-oxide inclusions
AI-generated identification · may be incorrectHardness about 7 Mohs; pink-red, cream, and gray coloration; vitreous to waxy luster; massive, nonfoliated texture with no obvious cleavage. The rounded, glossy surface indicates tumbling or polishing.
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Physical properties
Hardness about 7 Mohs; pink-red, cream, and gray coloration; vitreous to waxy luster; massive, nonfoliated texture with no obvious cleavage. The rounded, glossy surface indicates tumbling or polishing.
Formation & geological history
Likely formed when quartz-rich sandstone was metamorphosed and recrystallized, with iron oxides producing the red-pink colors; commonly Precambrian to Paleozoic in age, depending on locality.
Uses & applications
Used as a lapidary stone, cabochon, palm stone, and decorative aggregate; quartzite is also used for countertops, paving, and construction stone.
Geological facts
The specimen may alternatively be quartz-rich jasper if its red areas are opaque and microcrystalline. A glassy surface and uniform hardness are consistent with polished quartzite.
Field identification & locations
Identify by its very high hardness, granular quartz texture, and inability to scratch with a steel knife; quartz should scratch ordinary glass. Common sources include Brazil, Madagascar, India, and the United States.
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