mineral
Pale yellow tumbled stone, possibly calcite or quartz
Uncertain; likely calcite (CaCO₃) or pale chalcedony/quartz (SiO₂)
AI-generated identification · may be incorrectSmall, rounded and polished, cream-yellow with a waxy to vitreous luster; apparent hardness is indeterminate from the image—calcite is Mohs 3, quartz 7. No visible cleavage or crystal faces.
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Physical properties
Small, rounded and polished, cream-yellow with a waxy to vitreous luster; apparent hardness is indeterminate from the image—calcite is Mohs 3, quartz 7. No visible cleavage or crystal faces.
Formation & geological history
Calcite commonly forms in veins, limestone, and hydrothermal deposits; chalcedony forms from silica-rich groundwater in cavities and volcanic rocks. Geological age cannot be determined visually.
Uses & applications
Likely a low-value lapidary or decorative tumbled specimen, sometimes used in craft jewelry and collections.
Geological facts
The color may result from iron or other trace impurities. A steel-knife scratch and dilute vinegar test can help distinguish candidates, though testing may damage it.
Field identification & locations
Identify in the field by testing: calcite fizzes weakly with dilute hydrochloric acid and scratches easily; quartz does not fizz and resists a knife. Common sources include Mexico, Brazil, India, and the United States.
