metamorphic
Light-colored tumbled stone, likely quartzite or marble
Quartzite (mostly SiO₂) or calcitic marble (CaCO₃); exact identification is uncertain from the image
AI-generated identification · may be incorrectSmall, smooth, rounded specimen with pale gray-white color and granular texture; likely Mohs 3 for marble or 7 for quartzite, with vitreous to dull luster and no visible crystals or cleavage.
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Physical properties
Small, smooth, rounded specimen with pale gray-white color and granular texture; likely Mohs 3 for marble or 7 for quartzite, with vitreous to dull luster and no visible crystals or cleavage.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized under heat and pressure; marble forms from metamorphosed limestone. Both can range from Precambrian to younger geologic ages and occur in metamorphic belts worldwide.
Uses & applications
Commonly used as decorative stone, countertops, aggregate, and landscaping material; attractive pieces may be collected or used as worry stones and cabochons.
Geological facts
The key distinction is hardness: quartzite scratches glass, whereas calcitic marble reacts vigorously with dilute hydrochloric acid or vinegar and is easily scratched by steel.
Field identification & locations
Common sources include Brazil, India, the United States, and Europe. Test an inconspicuous area with a steel blade and vinegar; avoid destructive testing if polished or valuable.
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