mineral
Tumbled white stone, possibly quartz or marble
Uncertain; likely quartz (SiO₂) or calcite-rich marble (CaCO₃)
AI-generated identification · may be incorrectSmall polished, rounded off-white specimen with gray-brown inclusions or surface markings and a dull-to-waxy luster. Quartz has Mohs hardness 7 and no cleavage; marble/calcite has hardness 3 and prominent cleavage, but the image cannot establish this reliably.
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Physical properties
Small polished, rounded off-white specimen with gray-brown inclusions or surface markings and a dull-to-waxy luster. Quartz has Mohs hardness 7 and no cleavage; marble/calcite has hardness 3 and prominent cleavage, but the image cannot establish this reliably.
Formation & geological history
If quartz, it formed from silica-rich veins or crystallized igneous/metamorphic rocks; if marble, it formed by metamorphism of limestone. Geological age depends on its source and cannot be determined visually.
Uses & applications
Commonly sold as a decorative tumbled stone, pocket stone, or craft material; quartz varieties may be used in jewelry, while marble is used mainly for ornament and building stone.
Geological facts
The rounded shape and smooth surface indicate human tumbling or polishing rather than natural weathering. Apparent dark spots may be mineral inclusions, staining, or surface residue.
Field identification & locations
A hardness test, streak test, and dilute hydrochloric-acid test can distinguish likely quartz from calcite-bearing marble: quartz scratches glass and does not fizz, whereas calcite fizzes and is easily scratched. Common sources include Brazil, India, Madagascar, and domestic quarry materials.
